Related: fdo#80713 make 'Gif image', etc. translatable

Change-Id: I47d15623bd12b4b63a8d3701aaf1bebbba5ca7c5
(cherry picked from commit 33e9d408aa2c0a9b86c5daaed0e15d86f6c599dc)
Reviewed-on: https://gerrit.libreoffice.org/10017
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>