libgnome 2.17.91

What's new since 2.17.90

* Updated translations:
- Josep Puigdemont i Casamajó (ca)
- David Lodge (en_GB)
- Ivar Smolin (et)
- Jonathan Ernst (fr)
- Takeshi AIHANA (ja)
- Changwoo Ryu (ko)
- Duarte Loreto (pt)