remove  translations for unsupported languages

At the moment we are a relatively small community. We don't speak most
languages, which where supported previously. This resulted in a lot of
differences in quality and quantity of our translations.

We happily add languages again, if we find a maintainer for that
language.
Merge branch 'feature/rails3' into feature/rails3_drop_translations_we_cannot_support_at_the_moment
fixes failing cuces
fixin' failing tests related to languages dropped
Merge branch 'feature/rails3' into feature/rails3_drop_translations_we_cannot_support_at_the_moment
Merge pull request #190 from opf/feature/rails3_drop_translations_we_cannot_support_at_the_moment

Feature/rails3 drop translations we cannot support at the moment