Added Scottish Gaelic translation
Flesh out the traditional menu bar

This patch also changes the logic for when a menu bar is exported
instead of the appmenu, so that the appmenu fallback is never triggered.

https://bugzilla.gnome.org/show_bug.cgi?id=723864
menubar: use the same names used in the app menu for some commands
Updated Hebrew translation
[l10n] Updated Italian translation.
Updated Norwegian bokmål translation
Updated Galician translations
Tajik translation updated
Updated Spanish translation
Updated Brazilian Portuguese translation
Updated Ukrainian translation
Updated Kazakh translation
Updated Assamese translation
Updated Lithuanian translation
Updated Indonesian translation
Updated Brazilian Portuguese translation
Updated Aragonese translation
removed unused variable
fixed wrong drag&drop activation when in single click mode

when calling the parent button_press_event function a
button released event could be emitted, in that case
stop the drag&drop action.
show more rows in the drag icon when dragging multiple rows