v0.841 Japanese translation added & other improvements.

Version v0.841 is now live.

Changelog:

Japanese translation added.
Player is now able to find glow stone on hidden level, that provides some light in very dark buildings.
Breakable vases now use pulse shader to indicate to player that those vases are breakable.
Improvements in English text. (Thanks to StormBaron for the help with this).
Black hole on hidden level now works differently.
Some changes on hidden level.
Many other small changes and improvements.