Add I10n (Multi-Language support)

[tomlutzenberger]

Possibility to use another language than english.
A decision has to be made between:

1. Auto-Detection (Browser-Settings)
2. User-defined (needs settings page)

Also it needs to be defined, where the language files come from. Some extension stores (e.g. Mozilla) take a couple of weeks to review a new version. Given this fact, applying a small change or fix will be painful and annoying. It might be possible to load language files directly from the repo.

[Aegist]

Yes, this is important. We've had many requests in the past. We have quite active users in Dutch already. A few pages in French and have had requests for Arabic and Hungarian from people who say they have a community of people ready to get going as soon as it is ready for them.

The complication is that we don't handle foreign language content at all well in our backend - we don't filter the different languages in our browse page. But since few people use this, I don't think that really matters at the moment anyway - just another big job which gets exaggerated as soon as we open up multiple languages.

[gagarine]

@tomlutzenberger this API should be compatible with other browser: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Internationalization .