Please upgrade to 2.1.x here.
The 2.0 branch is no longer being updated.
Language Developers: Please Update Your Language Packs
Until recently (version 2.0.11). Vanilla's language support was unstructured, requiring you to put your translations into a variety of different places. I've made changes to the application to make translations work more like themes and plugins which should make things easier for people translating things.
In order to take advantage of these new features a bit of work has to be done to existing language packs. Don't worry, it's not hard and you can find guidance at http://vanillaforums.org/page/converting-locales
Once you update your language packs to locale packs and updated them on the addons site they should be slotted into the correct spot.@Ethneldryt