Merge pull request #255 from hmaon/master

crash from mindprobing empty tile, fixed
- Proper damage type when units stand in smoke.
Merge branch 'master' of github.com:SupSuper/OpenXcom
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
(upstream)
minor string fixes

- added STR_ZOMBIE to English.lng, EnglishUk.lng, Russian.lng, German.lng
- fixed a few alien names in Russian.lng based on ufopedia.org usage