Updated Spanish translation
Minimum current gtk+ version 3.9.0

Signed-off-by: Ignacio Casal Quinteiro <icq@gnome.org>
Use titlebar at GtkHeaderBar

Signed-off-by: Ignacio Casal Quinteiro <icq@gnome.org>
Add close button

Signed-off-by: Ignacio Casal Quinteiro <icq@gnome.org>
Use GtkButton subclasses instead of GdHeaderButton ones

Signed-off-by: Ignacio Casal Quinteiro <icq@gnome.org>
Dot not use GdHeaderBar
Fix warning
Port to GtkRevealer
1
Initialize panels only when they are not initialized
Revert changes made in commit ed7abdb for building with libgd

After porting to GtkStack, we do not need them any more.
Add necessary comments to the abstraction interface
Make the view's stack_panel property nullable