Set environtment for flatpak run
Problem: journalctl -xe: Exception: Anki requires a UTF-8 locale.
Soltion: change
/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=anki --file-forwarding net.ankiweb.Anki @@ %f @@
to
/usr/bin/flatpak run --branch=stable --env=LANG=en_US.UTF-8 --arch=x86_64 --command=anki --file-forwarding net.ankiweb.Anki @@ %f @@