Translations: make this git repo as light as possible.
We do not need all data here, this is only an 'helper' repo for building, reference one remains SVN bf-translations one. This commit: * Removes all files not needed for final translations building. * Makes remaining files much lighter by removing any non-translated/fuzzy/commented messages, as well as all comments. Removing all comments will also dramatically reduce the diff size on updates, since most of the differences typically comes from changes in ':src:' comments (line numbers). From now on, git i18n repo will be updated weekly, on same basis as svn trunk.