diff --git a/entrypoints/popup/index.html b/entrypoints/popup/index.html
index 4e95b5c..f608ab6 100644
--- a/entrypoints/popup/index.html
+++ b/entrypoints/popup/index.html
@@ -50,6 +50,7 @@ <h2 data-i18n="settingsHeading">Settings</h2>
             <option value="hi">हिन्दी</option>
             <option value="ru">Русский</option>
             <option value="zh">中文</option>
+            <option value="de">Deutsch</option>
           </select>
         </div>
         <div class="toggle-container">
diff --git a/entrypoints/sidebar/index.html b/entrypoints/sidebar/index.html
index 15dd10d..cfab411 100644
--- a/entrypoints/sidebar/index.html
+++ b/entrypoints/sidebar/index.html
@@ -51,6 +51,7 @@ <h2 data-i18n="settingsHeading">Settings</h2>
               <option value="hi">हिन्दी</option>
               <option value="ru">Русский</option>
               <option value="zh">中文</option>
+              <option value="de">Deutsch</option>
             </select>
           </div>
           <div class="toggle-container">
diff --git a/public/_locales/de/messages.json b/public/_locales/de/messages.json
new file mode 100644
index 0000000..a6b0e54
--- /dev/null
+++ b/public/_locales/de/messages.json
@@ -0,0 +1,748 @@
+{
+  "extensionName": {
+    "message": "Auto Tab Groups",
+    "description": "The name of the extension as it appears in the browser store and toolbar."
+  },
+  "extensionDescription": {
+    "message": "Gruppiert Tabs automatisch nach Domains.",
+    "description": "Short description shown in the extensions list."
+  },
+
+  "popupTitle": {
+    "message": "Auto Tab Groups",
+    "description": "Heading shown at the top of the popup/sidebar."
+  },
+  "popupGroupTabs": {
+    "message": "Tabs gruppieren",
+    "description": "Button that groups all open tabs immediately."
+  },
+  "popupUngroupAll": {
+    "message": "Alle Gruppen auflösen",
+    "description": "Button that removes every tab group."
+  },
+  "popupGenerateNewColors": {
+    "message": "Neue Farbe erzeugen",
+    "description": "Button that randomizes the colors of all groups."
+  },
+  "popupGenerateNewColorsTitle": {
+    "message": "Zufällige Gruppenfarbe. Farben werden automatisch für jede Domain/Regel gesichert und wieder hergestellt.",
+    "description": "Tooltip for the Generate New Colors button."
+  },
+  "popupCollapseAll": {
+    "message": "Alle zusammenklappen",
+    "description": "Button that collapses every group."
+  },
+  "popupExpandAll": {
+    "message": "Alle aufklappen",
+    "description": "Button that expands every group."
+  },
+
+  "settingsHeading": {
+    "message": "Einstellungen",
+    "description": "Heading for the main settings section."
+  },
+  "settingLanguage": {
+    "message": "Sprache",
+    "description": "Label for the UI language picker."
+  },
+  "settingLanguageAuto": {
+    "message": "Auto (Browser standard)",
+    "description": "Picker option that defers to the browser's UI language."
+  },
+  "settingAutoGroupMode": {
+    "message": "Autogruppierungsmodus",
+    "description": "Label for the toggle that enables automatic grouping."
+  },
+  "settingGroupBy": {
+    "message": "Gruppierung nach",
+    "description": "Label for the group-by mode selector."
+  },
+  "settingGroupByRulesOnly": {
+    "message": "Nur Regeln",
+    "description": "Option that groups only by custom rules."
+  },
+  "settingGroupByRulesAndDomain": {
+    "message": "Regeln & Domains",
+    "description": "Option that groups by rules plus base domain (popup)."
+  },
+  "settingGroupByRulesAndSubdomain": {
+    "message": "Regeln & Sub-domains",
+    "description": "Option that groups by rules plus subdomain (popup)."
+  },
+  "settingGroupByDomain": {
+    "message": "Domain",
+    "description": "Option that groups by base domain (sidebar)."
+  },
+  "settingGroupBySubdomain": {
+    "message": "Sub-domain",
+    "description": "Option that groups by subdomain (sidebar)."
+  },
+  "settingGroupNewEmptyTabs": {
+    "message": "Neuen leeren Tab in \"System\" einordnen",
+    "description": "Label for the toggle that groups blank/new tabs under a System group."
+  },
+  "settingMinimumTabsForGroup": {
+    "message": "Minimale Anzahl an Tabs für Erzeugung einer Gruppe",
+    "description": "Label for the numeric input that sets the minimum tab count required to create a group."
+  },
+  "settingAutoCollapseInactive": {
+    "message": "Autom. Zusammenklappen inaktiver Gruppen",
+    "description": "Label for the toggle that auto-collapses groups the user isn't looking at."
+  },
+  "settingCollapseDelay": {
+    "message": "Verzögerung des Zusammenklappens",
+    "description": "Label for the numeric input that sets the auto-collapse delay."
+  },
+  "settingCollapseDelayHelp": {
+    "message": "0 = sofort, oder eine Verzögerungszeit setzen (100-5000ms)",
+    "description": "Help text under the collapse-delay input."
+  },
+  "settingOpenNewTabsNextToCurrent": {
+    "message": "Neuen Tab neben aktuellen Tab öffnen",
+    "description": "Label for the toggle that opens new tabs adjacent to the active tab."
+  },
+  "settingPinnedTabsNote": {
+    "message": "Angepinnte Tabs nie gruppieren",
+    "description": "Informational note about pinned tabs."
+  },
+
+  "sortingSectionTitle": {
+    "message": "Sortierung",
+    "description": "Title for the collapsible sorting section."
+  },
+  "settingSortGroupsAlphabetically": {
+    "message": "Gruppen alphabetisch sortieren",
+    "description": "Toggle that keeps tab groups sorted alphabetically."
+  },
+  "settingSortDirection": {
+    "message": "Sortierreihenfolge",
+    "description": "Label for the sort direction toggle (A-Z vs Z-A)."
+  },
+  "settingSortDirectionAsc": {
+    "message": "A - Z",
+    "description": "Ascending alphabetical sort direction option."
+  },
+  "settingSortDirectionDesc": {
+    "message": "Z - A",
+    "description": "Descending alphabetical sort direction option."
+  },
+  "settingNumberGroups": {
+    "message": "Gruppennummerierung (1. AI, 2. Docs...)",
+    "description": "Toggle that prefixes group titles with their sort index."
+  },
+  "settingNumberGroupsHelp": {
+    "message": "Positionsnummer für schnellen Zugriff zum Titel hizufügen",
+    "description": "Help text describing the Number Groups toggle."
+  },
+
+  "aiSectionTitle": {
+    "message": "KI Funktionen",
+    "description": "Title for the AI features section."
+  },
+  "aiExperimentalBadge": {
+    "message": "Experimentell",
+    "description": "Badge shown next to the AI Features title."
+  },
+  "aiHelpTooltip": {
+    "message": "KI generierte Vorschläge für Tabgruppierung. Diese Funktion ist experimentell. Alle Prozesse laufen lokal in Browser - Keine Datenübermittlung an externe Server",
+    "description": "Tooltip explaining the AI Features."
+  },
+  "aiBadgeOn": {
+    "message": "An",
+    "description": "Status badge shown when AI is enabled."
+  },
+  "aiBadgeOff": {
+    "message": "Aus",
+    "description": "Status badge shown when AI is disabled."
+  },
+  "aiEnable": {
+    "message": "KI einschalten",
+    "description": "Toggle that enables or disables AI features."
+  },
+  "aiModelLabel": {
+    "message": "Modell",
+    "description": "Label for the AI model selector."
+  },
+  "aiStatusLabel": {
+    "message": "Status:",
+    "description": "Label for the AI model status."
+  },
+  "aiStatusIdle": {
+    "message": "Leerlauf",
+    "description": "AI model status: idle."
+  },
+  "aiStatusReady": {
+    "message": "Fertig",
+    "description": "AI model status: ready."
+  },
+  "aiStatusLoading": {
+    "message": "Lade $progress$%",
+    "description": "AI model status while loading, with a progress percentage.",
+    "placeholders": {
+      "progress": { "content": "$1", "example": "42" }
+    }
+  },
+  "aiStatusError": {
+    "message": "Fehler",
+    "description": "AI model status: error."
+  },
+  "aiLoadModel": {
+    "message": "Lade Modell",
+    "description": "Button that starts loading the AI model."
+  },
+  "aiUnloadModel": {
+    "message": "Lösche Modell",
+    "description": "Button that unloads the AI model."
+  },
+  "aiLoadingButton": {
+    "message": "Lade...",
+    "description": "Label shown on the load button while loading."
+  },
+  "aiRetryLoad": {
+    "message": "Neu laden",
+    "description": "Button shown after an AI model load error."
+  },
+  "aiWebGpuUnavailable": {
+    "message": "WebGPU kann nicht angesprochen werden. KI Funktionen benötigen einen Browser mit WebGPU Unterstützung.",
+    "description": "Warning shown when WebGPU is not supported."
+  },
+  "aiDownloadNote": {
+    "message": "Modelle laufen lokal im Browser. Zuvor muß das Modell heruntergeladen werden (~250MB-900MB).",
+    "description": "Help text beneath the load model button."
+  },
+  "aiSuggestGroups": {
+    "message": "Vorgeschlagene Gruppe",
+    "description": "Button that asks the AI to suggest tab groups."
+  },
+  "aiAnalyzing": {
+    "message": "Analysiere den Tab...",
+    "description": "Status text while the AI analyzes open tabs."
+  },
+  "aiNoSuggestions": {
+    "message": "Kein Vorschlag gefunden",
+    "description": "Status text shown when the AI returns zero suggestions."
+  },
+  "aiFailedToGetSuggestions": {
+    "message": "Vorschlagsermittlung fehlgeschlagen",
+    "description": "Error shown when AI suggestion fails."
+  },
+  "aiDismiss": {
+    "message": "Ablehnen",
+    "description": "Button that dismisses AI suggestions."
+  },
+  "aiApply": {
+    "message": "Akzeptieren",
+    "description": "Button that applies an AI suggestion."
+  },
+  "aiApplying": {
+    "message": "Anwenden...",
+    "description": "Button label while applying a suggestion."
+  },
+  "aiApplied": {
+    "message": "Angewendet!",
+    "description": "Button label after applying a suggestion."
+  },
+  "aiFailed": {
+    "message": "Fehlgeschlagen",
+    "description": "Button label after a suggestion fails."
+  },
+  "aiCreateRule": {
+    "message": "Regel erzeugen",
+    "description": "Button that creates a rule from a suggestion."
+  },
+  "aiTabsCount": {
+    "message": "$count$ tab$plural$",
+    "description": "Tab count label for a suggestion.",
+    "placeholders": {
+      "count": { "content": "$1" },
+      "plural": { "content": "$2" }
+    }
+  },
+  "aiAppliedWithStale": {
+    "message": "Angewendet ($count$ tab$plural$ geschlossen)",
+    "description": "Shown when a suggestion is applied but some tabs were closed.",
+    "placeholders": {
+      "count": { "content": "$1" },
+      "plural": { "content": "$2" }
+    }
+  },
+  "aiFirefoxNotice": {
+    "message": "KI Funktionalität ist zur Zeit nur auf Chrome verfügbar. Firefox Unterstützung kommt später.",
+    "description": "Notice shown to Firefox users."
+  },
+
+  "rulesSectionTitle": {
+    "message": "Angepasste Regeln",
+    "description": "Title for the custom rules section."
+  },
+  "rulesAddNewRule": {
+    "message": "Neue Regel hinzufügen",
+    "description": "Button that opens the new rule dialog."
+  },
+  "rulesExport": {
+    "message": "Export",
+    "description": "Button that exports rules to JSON."
+  },
+  "rulesImport": {
+    "message": "Import",
+    "description": "Button that imports rules from JSON."
+  },
+  "rulesExportTitle": {
+    "message": "Exportieren aller Regeln in eine JSON Datei",
+    "description": "Tooltip on the Export button."
+  },
+  "rulesImportTitle": {
+    "message": "Importiere Regel aus einer JSON Datei",
+    "description": "Tooltip on the Import button."
+  },
+  "rulesExportImportHelp": {
+    "message": "Exportiere/importiere Regeln als JSON Datei für Backup oder Verteilung",
+    "description": "Help text under the export/import buttons."
+  },
+  "rulesEmptyState": {
+    "message": "Keine angepassten Regeln vorhanden. Erzeuge deine erste Regel für die Tapgruppierung nach deinen Wünschen!",
+    "description": "Shown when there are no custom rules."
+  },
+  "rulesEdit": {
+    "message": "Editieren",
+    "description": "Edit button on a rule row."
+  },
+  "rulesDelete": {
+    "message": "Löschen",
+    "description": "Delete button on a rule row."
+  },
+  "rulesEditTitle": {
+    "message": "Editiere Regel",
+    "description": "Tooltip for the edit button."
+  },
+  "rulesDeleteTitle": {
+    "message": "Lösche Regel",
+    "description": "Tooltip for the delete button."
+  },
+  "rulesAddTabTitle": {
+    "message": "Tab zu existierender Regel hinzufügen",
+    "description": "Tooltip for the + button that adds the current tab to a rule."
+  },
+  "rulesDeleteConfirm": {
+    "message": "Wollen sie die Regel \"$name$\" wirklich löschen?",
+    "description": "Confirmation prompt before deleting a rule.",
+    "placeholders": {
+      "name": { "content": "$1" }
+    }
+  },
+  "rulesFailedToLoad": {
+    "message": "Laden der angepassten Regeln fehlgeschlagen!",
+    "description": "Error when loading rules fails."
+  },
+  "rulesFailedToDelete": {
+    "message": "Löschen der Regel fehlgeschlagen!",
+    "description": "Error when deleting a rule fails."
+  },
+  "rulesExportSuccess": {
+    "message": "Regel erfolgreich exportiert!",
+    "description": "Confirmation after exporting rules."
+  },
+  "rulesFailedToExport": {
+    "message": "Export der Regeln fehlgeschlagen!",
+    "description": "Error when export fails."
+  },
+  "rulesImportSuccess": {
+    "message": "Regel erfolgreich importiert!",
+    "description": "Confirmation after importing rules."
+  },
+  "rulesImportSummary": {
+    "message": "Import erfolgreich!\nImportiert: $imported$ Regel(n)\nÜbersprungen: $skipped$ Regel(n)",
+    "description": "Summary shown after rules are imported.",
+    "placeholders": {
+      "imported": { "content": "$1" },
+      "skipped": { "content": "$2" }
+    }
+  },
+  "rulesFailedToImport": {
+    "message": "Import der Regeln fehlgeschlagen!",
+    "description": "Error when import fails."
+  },
+  "rulesImportReplacePrompt": {
+    "message": "Wollen sie alle Regeln ersetzen?\n\nKlick OK um alle Regeln durch die importierten zu ERSETZEN\nKlick Abbrechen um die importierten Regeln HINZUZUFÜGEN",
+    "description": "Prompt that asks whether to merge or replace on import."
+  },
+  "rulesNoExport": {
+    "message": "Keine Regeln zum exportieren",
+    "description": "Tooltip shown on a disabled export button when there are no rules."
+  },
+  "rulesNoDomains": {
+    "message": "Keine Domains",
+    "description": "Shown when a rule has no configured domains."
+  },
+  "rulesDomainsSeparator": {
+    "message": " und $count$ weitere",
+    "description": "Appended to truncated domain lists.",
+    "placeholders": {
+      "count": { "content": "$1" }
+    }
+  },
+  "rulesAddTabNoTab": {
+    "message": "Kein aktiver Tab gefunden",
+    "description": "Tooltip shown on the add-tab button when no active tab is available."
+  },
+  "rulesAddTabCantExtract": {
+    "message": "Kann die Domain von diesem Tab nicht ermitteln",
+    "description": "Tooltip when the current tab's URL has no domain."
+  },
+  "rulesAddTabAlreadyExists": {
+    "message": "Domain ist bereits in dieser Regel",
+    "description": "Tooltip when the tab's domain is already part of the rule."
+  },
+  "rulesAddTabAdded": {
+    "message": "Hinzugefügt!",
+    "description": "Tooltip shown briefly after adding a tab to a rule."
+  },
+  "rulesAddTabFailed": {
+    "message": "Hinzufügen der Domain fehlgeschlagen",
+    "description": "Tooltip when adding a domain fails."
+  },
+
+  "blacklistSectionTitle": {
+    "message": "Sperrliste",
+    "description": "Title for the blacklist section."
+  },
+  "blacklistAddButton": {
+    "message": "Zur Sperrliste hinzufügen",
+    "description": "Button to add a domain to the blacklist."
+  },
+  "blacklistHelp": {
+    "message": "Gesperrte Domains werden niemals gruppiert",
+    "description": "Help text under the blacklist section."
+  },
+  "blacklistEmpty": {
+    "message": "Keine gesperrten Domains vorhanden.",
+    "description": "Shown when the blacklist is empty."
+  },
+  "blacklistEditTitle": {
+    "message": "Sperrliste bearbeiten",
+    "description": "Tooltip for the blacklist edit button."
+  },
+  "blacklistDeleteTitle": {
+    "message": "Sperrliste leeren",
+    "description": "Tooltip for the blacklist delete button."
+  },
+
+  "advancedSectionTitle": {
+    "message": "Erweiterte Einstellungen",
+    "description": "Title for the advanced settings section."
+  },
+  "advancedHideContextMenu": {
+    "message": "Rechts-Klick Kontextmenu deaktivieren",
+    "description": "Toggle that hides the extension's context menu items."
+  },
+  "advancedHideContextMenuHelp": {
+    "message": "Wenn aktiviert, werden keine Auto Tab Group Einträge zum Kontext Menu hinzugefügt.",
+    "description": "Help text for the hide context menu toggle."
+  },
+
+  "footerMadeBy": {
+    "message": "Erstellt von",
+    "description": "Prefix for the author attribution in the footer."
+  },
+  "footerFor": {
+    "message": "für",
+    "description": "Connector text: 'Made by X, for Chrome'."
+  },
+  "footerBrowserChrome": {
+    "message": "Chrome",
+    "description": "Name of the Chrome browser in the footer."
+  },
+  "footerBrowserFirefox": {
+    "message": "Firefox",
+    "description": "Name of the Firefox browser in the footer."
+  },
+  "footerFeedback": {
+    "message": "Rückmeldung & Anregungen & Support",
+    "description": "Text of the feedback link."
+  },
+  "footerVersion": {
+    "message": "Version:",
+    "description": "Prefix before the version number."
+  },
+
+  "contextMenuCreateRuleFromGroup": {
+    "message": "Erzeuge Regel von Gruppe",
+    "description": "Right-click menu: create a custom rule from the clicked tab's group."
+  },
+  "contextMenuAddTabToExistingRule": {
+    "message": "Tab zu existierender Regel hinzufügen",
+    "description": "Right-click menu: submenu to add the current tab's domain to an existing rule."
+  },
+  "contextMenuAddToBlacklist": {
+    "message": "Zur Sperrliste hinzufügen",
+    "description": "Right-click menu: add the current tab's domain to the blacklist."
+  },
+  "contextMenuNoRulesYet": {
+    "message": "Keine Regeln vorhanden",
+    "description": "Disabled placeholder shown when the Add Tab submenu has no rules."
+  },
+
+  "ruleModalCreateTitle": {
+    "message": "Angepasste Regel erzeugen",
+    "description": "Title shown when creating a new rule."
+  },
+  "ruleModalEditTitle": {
+    "message": "Angepasste Regel bearbeiten",
+    "description": "Title shown when editing an existing rule."
+  },
+  "ruleModalNameLabel": {
+    "message": "Regelname",
+    "description": "Label for the rule name input."
+  },
+  "ruleModalNamePlaceholder": {
+    "message": "z.b., Arbeitsapps",
+    "description": "Placeholder for the rule name input."
+  },
+  "ruleModalNameHelp": {
+    "message": "Unterstützt alle Sprachen wie z.b. Chinesisch, Japanisch, Koreanisch und Emojis",
+    "description": "Help text under the rule name input."
+  },
+  "ruleModalAiAssistLabel": {
+    "message": "KI Assistent",
+    "description": "Label for the AI assist section."
+  },
+  "ruleModalAiAssistPlaceholder": {
+    "message": "Beschreibe deine Regel, z.b., 'Group all Google services' or 'Group AWS console tabs'",
+    "description": "Placeholder for the AI assist input."
+  },
+  "ruleModalAiGenerate": {
+    "message": "Erzeugen",
+    "description": "Button that asks the AI to generate a rule."
+  },
+  "ruleModalAiAssistHelp": {
+    "message": "Beschreibe, was du willst und die KI wird Namen, Domains und Farbe vorschlagen",
+    "description": "Help text under the AI assist input."
+  },
+  "ruleModalPatternModeLabel": {
+    "message": "Muster Modus",
+    "description": "Label for the pattern mode toggle."
+  },
+  "ruleModalPatternModeSimple": {
+    "message": "Einfach (Domains)",
+    "description": "Simple pattern mode: matches whole domains."
+  },
+  "ruleModalPatternModeExplicit": {
+    "message": "Speziell (komplette URLs)",
+    "description": "Explicit pattern mode: matches full URLs."
+  },
+  "ruleModalSimpleModeHint": {
+    "message": "Gruppiere alle Seiten mit dieser Domain",
+    "description": "Hint shown in simple pattern mode."
+  },
+  "ruleModalExplicitModeHint": {
+    "message": "Gruppiere nur Seiten, die auf das URL Muster passen",
+    "description": "Hint shown in explicit pattern mode."
+  },
+  "ruleModalPatternsLabel": {
+    "message": "URL Muster (eine pro Zeile)",
+    "description": "Label for the patterns textarea."
+  },
+  "ruleModalPatternsHelp": {
+    "message": "Akzeptiert: Domains, wildcards (*.example.com), Pfade (example.com/api/*), IP Adressen",
+    "description": "Help text for the patterns textarea."
+  },
+  "ruleModalColorLabel": {
+    "message": "Gruppenfarbe",
+    "description": "Label for the color picker."
+  },
+  "ruleModalColorBlue": { "message": "Blau", "description": "Color option: blue." },
+  "ruleModalColorRed": { "message": "Rot", "description": "Color option: red." },
+  "ruleModalColorYellow": { "message": "Gelb", "description": "Color option: yellow." },
+  "ruleModalColorGreen": { "message": "Grün", "description": "Color option: green." },
+  "ruleModalColorPink": { "message": "Rosa", "description": "Color option: pink." },
+  "ruleModalColorPurple": { "message": "Violett", "description": "Color option: purple." },
+  "ruleModalColorCyan": { "message": "Türkis", "description": "Color option: cyan." },
+  "ruleModalColorOrange": { "message": "Orange", "description": "Color option: orange." },
+  "ruleModalColorGrey": { "message": "Grau", "description": "Color option: grey." },
+  "ruleModalEnabledLabel": {
+    "message": "Aktiv",
+    "description": "Checkbox: whether the rule is enabled."
+  },
+  "ruleModalSave": {
+    "message": "Speichere Regel",
+    "description": "Submit button for the rule form."
+  },
+  "ruleModalUpdate": {
+    "message": "Aktualisiere Regel",
+    "description": "Submit button when editing an existing rule."
+  },
+  "ruleModalCancel": {
+    "message": "Abbrechen",
+    "description": "Cancel button for the rule form."
+  },
+  "ruleModalConflictTitle": {
+    "message": "Musterkonflikt erkannt",
+    "description": "Heading of the conflict warning box."
+  },
+  "ruleModalConflictSubtitle": {
+    "message": "Diese Muster kollidiert mit existierenden Regeln. Tabs, die zu mehreren Regeln passen, werden nur einer Gruppe zugeordnet.",
+    "description": "Subtitle of the conflict warning."
+  },
+  "ruleModalAiSuggestions": {
+    "message": "KI Vorschlag",
+    "description": "Heading for the AI-generated resolution suggestions."
+  },
+  "ruleModalSaveAnyway": {
+    "message": "Trotzdem Speichern",
+    "description": "Button that saves the rule despite conflicts."
+  },
+  "ruleModalGoBack": {
+    "message": "Zurück",
+    "description": "Button that returns to editing after a conflict warning."
+  },
+  "ruleModalChecking": {
+    "message": "Prüfen...",
+    "description": "Label shown on the save button while checking for conflicts."
+  },
+  "ruleModalGenerating": {
+    "message": "Erzeugen...",
+    "description": "Label shown on the AI generate button while generating a rule."
+  },
+  "ruleModalAiThinking": {
+    "message": "KI denkt nach...",
+    "description": "Status text while the AI generates a rule."
+  },
+  "ruleModalAiNeedsModel": {
+    "message": "Wähle ein KI Modell von dem KI Eigenschaftspopup für den KI Assistent",
+    "description": "Status shown when AI Assist is invoked but no model is loaded."
+  },
+  "ruleModalAiGenerated": {
+    "message": "Regel erzeugt! Überprüfe und bearbeite unten, dann Speichern.",
+    "description": "Status after the AI generates a rule."
+  },
+  "ruleModalAiGenerateError": {
+    "message": "Regelerzeugung gescheitert. Versuche deine Beschreibung zu optimieren.",
+    "description": "Error shown when AI rule generation fails."
+  },
+  "ruleModalAiEnterDescription": {
+    "message": "Bitte gebe eine Beschreibung ein",
+    "description": "Error shown when AI Assist is triggered with no description."
+  },
+  "ruleModalEnterPattern": {
+    "message": "Bitte gebe mindestens ein URL Muster an",
+    "description": "Alert shown when submitting with no patterns."
+  },
+  "ruleModalEnterName": {
+    "message": "Bitte gebe einen Name für die Regel ein",
+    "description": "Alert shown when submitting a rule with no name."
+  },
+  "ruleModalFailedToLoad": {
+    "message": "Laden der Regel zum Bearbeiten gescheitert",
+    "description": "Alert when the rule modal can't load the rule."
+  },
+  "ruleModalFailedToSave": {
+    "message": "Speichern der Regel zum Bearbeiten gescheitert",
+    "description": "Alert when saving a rule fails."
+  },
+
+  "importPageTitle": {
+    "message": "Importiere Regeln",
+    "description": "Title for the import rules page."
+  },
+  "importDropInstruction": {
+    "message": "Ziehe eine JSON Datei hierher",
+    "description": "Instruction shown in the import drop zone."
+  },
+  "importOr": {
+    "message": "oder",
+    "description": "Separator between drag-drop and button."
+  },
+  "importBrowseFiles": {
+    "message": "Suche Datei",
+    "description": "Button that opens the file picker."
+  },
+  "importPreviewHeading": {
+    "message": "Vorschau",
+    "description": "Heading above the import preview."
+  },
+  "importModeLabel": {
+    "message": "Import Modus",
+    "description": "Label above the import mode radio buttons."
+  },
+  "importMerge": {
+    "message": "Zusammenführen mit vorhandenen Regeln",
+    "description": "Radio option: merge on import."
+  },
+  "importReplace": {
+    "message": "Alle vorhandenen Regeln ersetzen",
+    "description": "Radio option: replace on import."
+  },
+  "importButton": {
+    "message": "Importiere Regeln",
+    "description": "Button that performs the import."
+  },
+  "importCancel": {
+    "message": "Abbrechen",
+    "description": "Cancel button on the import page."
+  },
+  "importStatValid": {
+    "message": "Gültige Regeln",
+    "description": "Label for the valid rule count in the import preview."
+  },
+  "importStatInvalid": {
+    "message": "Ungültig (wird ignoriert)",
+    "description": "Label for the invalid rule count in the import preview."
+  },
+  "importPatternsSuffix": {
+    "message": "$count$ Muster",
+    "description": "Label showing pattern count for an imported rule.",
+    "placeholders": {
+      "count": { "content": "$1" }
+    }
+  },
+  "importMoreRules": {
+    "message": "...und $count$ mehr Regeln",
+    "description": "Shown when more rules exist beyond the preview slice.",
+    "placeholders": {
+      "count": { "content": "$1" }
+    }
+  },
+  "importUnnamed": {
+    "message": "Unbekannt",
+    "description": "Placeholder name for rules with no name."
+  },
+  "importImporting": {
+    "message": "Importiere...",
+    "description": "Label on the import button while importing."
+  },
+  "importSuccess": {
+    "message": "Erfolgreich importierte $count$ Regeln",
+    "description": "Success message after import.",
+    "placeholders": {
+      "count": { "content": "$1" }
+    }
+  },
+  "importSuccessWithSkipped": {
+    "message": "Erfolgreich importierte $count$ Regeln ($skipped$ ignoriert)",
+    "description": "Success message when some rules are skipped.",
+    "placeholders": {
+      "count": { "content": "$1" },
+      "skipped": { "content": "$2" }
+    }
+  },
+  "importFailed": {
+    "message": "Import fehlgeschlagen",
+    "description": "Generic import failure message."
+  },
+  "importInvalidJson": {
+    "message": "Kein JSON",
+    "description": "Error when file is not valid JSON."
+  },
+  "importInvalidFormat": {
+    "message": "Ungültiges Dateiformat: Fehlende 'rules' Sektion",
+    "description": "Error when file has no 'rules' key."
+  },
+  "importNoRules": {
+    "message": "Keine Regel in der Datei gefunden",
+    "description": "Error when file has no rules."
+  },
+  "importSelectJson": {
+    "message": "Bitte eine JSON Datei auswählen",
+    "description": "Error when a non-JSON file is selected."
+  }
+}
diff --git a/types/storage.ts b/types/storage.ts
index 6748320..62afb4d 100644
--- a/types/storage.ts
+++ b/types/storage.ts
@@ -24,7 +24,7 @@ export type SortDirection = "asc" | "desc"
  * User-selected UI locale. "auto" defers to the browser's UI locale.
  * Widen this union when shipping additional locales.
  */
-export type UserLocale = "auto" | "en" | "he" | "ar" | "es" | "hi" | "ru" | "zh"
+export type UserLocale = "auto" | "en" | "he" | "ar" | "es" | "hi" | "ru" | "zh" | "de"
 
 /**
  * Mapping of group titles to their colors