Updated Hebrew translation (by Isratine Citizen).

From: Isratine Citizen <genghiskhan@gmx.ca>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@816 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Command validation no longer prevents saving.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@817 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Add warning if command does not have executable first argument.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@818 ef8490bc-f317-4725-81ed-e95a9aca1bcf