I18n: Update translation ast (95%).

207 translated messages, 9 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ast (99%).

214 translated messages, 2 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix building with --disable-desktop-icons
Fix build warnings with --disable-file-icons

And g_memmove was deprecated in glib 2.40.
Fix build warnings with --disable-desktop-menu
Add autogenerated files to POTFILES.skip

This keeps FreeBSD and OpenBSD building with a gmake distcheck.