Update translation

Translation for new layer
That's exactly what I meant. The data owner modified the geocat entry with "connection" instead of "connexion"

My suggestion here:
- merge this branch even with the strange translation, since there will be other translations waiting and we are risking a delicate situation like last time
- meanwhile, contact the data owner ( @kandre, I'll let you write an email or ask Mario to do it)
- wait for an answer and update the translation. Otherwise we should go as it is... it's officially the official name ;)