v0.841 Japanese translation added & other improvements.

Version v0.841 is now live. [h1]Changelog:[/h1] [list] [*] 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. [/list]