Add an empty Latvian translation

--HG--
branch : release-2.x.y
Add an empty Tatar translation

--HG--
branch : release-2.x.y
Update the Occitan translator

--HG--
branch : release-2.x.y
Update the Telugu translator

If the old translator responds to me (or otherwise resurfaces soon), we
should probably revert this.

--HG--
branch : release-2.x.y
Revert to the old Telugu maintainer

The existing translator is active and will coordinate the language in
Transifex.

--HG--
branch : release-2.x.y
Update libgadu to the current version from repo

--HG--
branch : release-2.x.y