From the glade .ui files. Currently the script doesn't check for
identical tooltip_text.

Change-Id: Ic6b80e7eb0ced2e4515cc57d3b548b26cef5b67c
Reviewed-on: https://gerrit.libreoffice.org/29366Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>