0.980 - Pre-prelease update!

[list] [*] Cannons fix - I had to disable two units out of the game due to bugs. Now they are back [*] Brute bugfix - he used to freeze the game. He promised never to do it again [*] More fine sound volume settings [*] Better French localization - thanks to the player iXeRay [*] Bugfixes! [/list] And not for demo: +7 bossfights and +2 heroes