* Install the gThumb import desktop file. (Bruce Schultz)
* Contact sheet: fixed themes list always empty.
* Thumbnailer: try with the system thumbnailer if the image is null
(!184)
* File chooser: correctly get the filename extension.
New or updated application translations:
* Basque (Asier Sarasua Garmendia)
* Romanian (Adi Roiban)
