deskutils/foliate: fix plist

> Checking for items in STAGEDIR missing from pkg-plist

Error: Orphaned: share/locale/eu/LC_MESSAGES/com.github.johnfactotum.Foliate.mo
Error: Orphaned: share/locale/nb/LC_MESSAGES/com.github.johnfactotum.Foliate.mo
Error: Orphaned: share/locale/nn/LC_MESSAGES/com.github.johnfactotum.Foliate.mo