I've been wanting to do this for a while but simply never got around to it (and since we're still without an l10n manager it is falling on me, primarily), but on CrowdIn there are quite a few languages that are almost complete, as in 97%+, and I honestly see no reason to not publish them in that state (i.e. with a little bit of English left here or there) since they are, after all, a convenience and don't necessarily have to be 200% perfect. Of course it would be great, but since this is all volunteer effort I'm being realistic here in that it is "best effort".
So, I'm planning to add the following languages to the available line-up as published languages on the add-ons site:
- Arabic (ar)
- Chinese Traditional (zh-TW)
- Croatian (hr)
- Danish (da)
- Finnish (fi)
- Galician (gl)
- Indonesian (id)
- Icelandic (is)
This one is only at 93% but all the main interface stuff should be done and I'm aware the number of people involved in this language will be extremely limited. - Japanese (ja)
- Romanian (ro)
- Serbian (cyrillic) (sr)
- Slovenian (sl)
- Thai (th)
As always anyone who is fluent in these (or other!) languages is welcome to join the other translators on CrowdIn to help complete (and maintain!) existing languages.
If you would like to start a new language, let me know -- but be aware that the browser has a lot of localization strings that aren't immediately apparent when you look at the GUI.
Languages that need a little bit more love but are almost there are Persian (fa), Vietnamese (vi) and Kannada (kn),