feat(i18n): Localize date and time formatting based on user's language

[hakonharnes]

Relates issue: #340 (partially solves it).

Summary

• Dates and times now display in the user's selected language instead of always showing in English
• Relative times (e.g., "2 hours ago") are also localized (e.g., "for 2 timer siden" in Norwegian)

Changes

• Added global date/time formats (short, long, shortWithTime) in src/i18n/request.ts
• Replaced date-fns formatting with next-intl's useFormatter (client) and getFormatter (server)
• Updated relevant components.

Example: Long dates

Example: Short dates

Example: Relative dates

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