added STR_ZOMBIE to several .lng files, fixed several Russian strings, fixed my code formatting, a compiler warning, and a TU reserve bug

edit: added one more fix, to avoid changing _tuReserved in BattlescapeGame::checkReservedTU() when _tuReserved is set to BA_AUTOSHOT and the soldier has a non-autofiring weapon. Otherwise, _tuReserved is permanently set to BA_SNAPSHOT.