Make everything translatable

I'm currently messing with RPGme on my own fork, and although I don't have time for it now to implement it, I noticed there are still way too many strings hardcoded in RPGme. It's nice that I can translate all the Skills, but when I can't translate each and every text that is shown in RPGme, my users will have an inconsistent experience which is something that definetely needs to be avoided.