What a great way to start the day... thank you for all yoru answers. Apparently the Custom Name feature seems to frighten some people but the fact is that you can't force your contacts to see whatever you want in their contact list. However, as there is a point to changing its own name, your real name is displayed while you chat, the custom name is just displayed in the contact list.
As for translations, you'll be notified when everything is ready to be translated, which will probably be
after the public beta release.
Gotta fix some bugs now... last note: if you haven't been an internal beta tester for this version it's probably because you didn't asked
.
Patchou