About the colors: it's not a bug, it's a normal behaviour. You're using too many colors in your
long nick, so ColorNick deletes color codes to get a shorter raw nickname (< 129 characters). For the moment there is no way to have a longer nick, so please use less colors or a shorter nick !
Now about the "Voir le pseudo" bug... This string is stored, with all others messages (errors, etc...), in a resource file for both languages (English=1033 and French=1036). It doesn't change when you change ColorNick's
interface language. I think Windows should use the right translation (French system -> French translation; others -> English ?). I also see that the contact showed in screenshots speaks French, and so do you. If you have a French Windows, it's normal for you to see "Voir le pseudo". Why don't use the French interface of ColorNick?