Added a Norwegian translation. Replaced non-breaking whitespaces with \xa0 in some French and Polish lines.

I've not tested it thoroughly in a built state, but I don't think I left any mistakes that would prevent a build. 

In other news, there's one tidbit I noticed when testing, I'm not sure if it's just me but when mustBeRoot_1 is printed in some languages, it seems to mess up and give some weird unicode symbol. I didn't test all the languages, but it appears in Swedish, Polish and Norwegian.. I hope that's not my fault!