Fixed duplicate string ID
Fixed strange visible tiles from upper levels
- Fix #4359780 for crash when undefended base is attacked.
- Fixed alien corpses not being recovered.
- Fixed uncontained live aliens not turning into corpses.
- Fixed various errors in live alien recovery.
- Fixed garbled strings in Graphs.
- Fixed terrorist units not getting weapons.
- Fixed missing string templates in Battlescape.
- Fixed various errors in ruleset.

WARNING: WILL BREAK YOUR BATTLESCAPE SAVES. Finish your Battlescape missions before using this build.
Updated spanish translation.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
Fixed garbled strings in Base Defense.
Updated Czech translation.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
- fixed debriefing crash when tank was destroyed
- fixed base info crash if soldiers are out
- fixed basedefence mission start crash when soldiers are out