Convert RID_SVX_MDLG_FONTWORK_GALLERY to .ui

Change-Id: I18c02b6c1f9ea9642d3f04092f7df4dcc9d92990
Reviewed-on: https://gerrit.libreoffice.org/8689
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Updated core
Project: help  440af54dcae5a9380810ba81b68bdf198730423b