gettext

ac5c1120 - Extend the AppData "language" to also support AppStream metainfo files.

Extend the AppData "language" to also support AppStream metainfo files. Fixes <https://savannah.gnu.org/bugs/?50414>, reported by Piotr Drąg <piotrdrag@gmail.com>. * gettext-tools/its/metainfo.its: Renamed from gettext-tools/its/appdata.its. * gettext-tools/its/metainfo.loc: Renamed from gettext-tools/its/appdata.loc. Recognize also suffix ".metainfo.xml". * gettext-tools/its/Makefile.am (dist_its_DATA): Update. * gettext-tools/src/x-appdata.h: Update comment.