version 3.10.4
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 Bugs fixed:

  * 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)