I realized a minor regression since 0.19.6. With the provided reproducing steps, xgettext is invoked with the '-L Glade' option and it works. However, if the option is not given, xgettext produces the same warnings, as *.glade is not recognized as a GtkBuilder file. I recall that we equally treated *.glade and *.ui files in 0.19.6.
I don't know how widely the *.glade file extension is used for GtkBuilder files, but it would be a bit safer to add one line patch to /usr/share/gettext-0.19.7/its/glade.loc: https://git.sv.gnu.org/cgit/gettext.git/commit/?id=21ca680c I might update the Fedora package with this, if there is any FTBFS caused by this change. Thanks, -- Daiki Ueno