Log Message:
Update to 0.8:

* Fixed #151737 (Martyn)
* Group chats now support tabbed windows (Geert-Jan)
* If only one window exists, open new chats in that window (Martyn)
* Fixed window title (Micke)
* Fixed issue when Gossip sent replies to error messages (Micke)
* New translations (nb, tr, bg)
* Updated translations (cs, pt_BR, fr, de, ca, da, nl, no, en_CA, zh_TW,
                        en_GB, lt, eu, sv)