Updated Basque language
doap: update URLs
Updated Slovenian translation
Updated Greek translation
Prepare 3.13.1
Updated Swedish translation
[l10n] Update Catalan translation
[l10n] Updated Catalan (Valencian) translation
appdata: update license metadata
Require GTK+ 3.12

For GTK_DIALOG_USE_HEADER_BAR
Use a header bar on the preferences dialog
Updated Czech translation
appdata: fix spelling of metadata-license tag
remove GamesStock
GamesFrame: fully name all properties
Remove dead assignments
Updated Lithuanian translation
Be more careful with callback types

Placate Tartan
Updated POTFILES.in
Updated Basque language