Related: fdo#41169 fix GTK non-Latin keyboard layout with Latin shortcuts

See also rhbz#958300

Change-Id: I5c3cf9652adb7b1c9ec53a32ed39f231a09ae1d7
(cherry picked from commit 8cef6c7ec67aec88b339ca647e784afbabf190f8)
Reviewed-on: https://gerrit.libreoffice.org/6759
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>
Tested-by: Khaled Hosny <khaledhosny@eglug.org>