Don't ignore dist/i18n folder

Fixes #433
Extract available languages to a constant
Dynamically feed $translateProvider from LOCALES
Add more flags for future tasks
Organize flags alphabetically
Add comment about future locales
Merge pull request #434 from latin-language-toolkit/future_locales

Extracting supported languages to a constant
Merge remote-tracking branch 'upstream/master' into french-i18n