Fixed problem when closing color chooser dialog without selecting color
Move End Process button in a toolbar

https://bugzilla.gnome.org/show_bug.cgi?id=706065
Make the headerbar a titlebar

https://bugzilla.gnome.org/show_bug.cgi?id=705088
Tajik translation updated
Load a custom CSS and add a couple of borders

As per designer's request, we add a border to the
process toolbar and to the header bar.
Add missing file

Forgot to add the file in previous commit
Merged from master