unify spelling in data/locations.json and in event files

[szabgab]

There are a few names that had several spellings in the data/events/*.json files and thus I added them all to the locations.json file. eg. 'Munich' and 'München'. They should be merged.

[MLRiain]

Usually the language of the website is decided by the owner. It appears that codeandtalk.com is in American English and therefore, place names should consistently use that spelling - Munich, not München; Brazil, not Brasil; etc. I found "Brasil" in the locations file so I used that in the country field, even though the conference website has "Brazil" and I used "Brazil" in the name field and in the json filename. I checked other files and found the same mixture of spellings had been used. I think they all need to be corrected to be consistent (including the locations file).