Updated gujarati translations
Updated Korean translation
Updated Norwegian bokmål translation.
main: Split up check of whether to thumbnail
main: Also thumbnail videos from GrlFilesystem
[l10n] Update Catalan translation
[l10n] Updated Catalan (Valencian) translation
Updated Russian translation
Updated Latvian translation
save-file: Handle an unset Videos directory

This also fixes ~/Videos being used instead of the path to the real
videos directory.

https://bugzilla.gnome.org/show_bug.cgi?id=736231
Finnish translation update by Jiri Grönroos