i18n: code clean-up

- Move all translation-related declarations to BLF_translation.h
- Reverted some changes to match trunk svn rev40365

source/gameengine/GamePlayer/ghost/GPG_ghost.cpp

@@ -997,6 +997,7 @@ int main(int argc, char** argv)
 	// Cleanup
 	RNA_exit();
 	BLF_exit();
+	BLF_free_unifont();
 	IMB_exit();
 	free_nodesystem();