adjust colors: Fix the undo symbols in RTL

https://bugzilla.gnome.org/show_bug.cgi?id=723542
rotate image: Fix the undo symbols in RTL

https://bugzilla.gnome.org/show_bug.cgi?id=723542
sharpen: Fix the undo symbols in RTL

https://bugzilla.gnome.org/show_bug.cgi?id=723542
toolbox: Fix the undo and the redo symbols in RTL

https://bugzilla.gnome.org/show_bug.cgi?id=723542