Several bug fixes, improvements and translations

MODIFY: Several bug fixes
A lot of bus fixed in order to guarantee that the game actions (like
inability to drop items) occurs only during the game.
Also, there were some bugs with null pointers that were fixed

MODIFY: Commented the pricipal classes
Commented principal classes and methods.

MODIFY: Changed commands
Now to leave the game the command to use is /dlv abandonar
All the commands are now under /dlv command.