Updated Hedgewars source languages

<from irc://irc.freenode.net/#hedgewars>
[18:40:31] <@sheepluva> the game engine is in pascal
[18:40:37] <@sheepluva> the pc frontend in C++ (qt)
[18:40:42] <@sheepluva> and only the server is in Haskell

You can also check the relevant sections of the repo