Dragonlord [1] filed a deletion request for omegat-plugin-yandex [2]: Yandex cloud translation feature had already been integrated into OmegaT mainline at least in OmegaT 4.3. The plugin project looks dead.
[1] https://aur.archlinux.org/account/Dragonlord/ [2] https://aur.archlinux.org/pkgbase/omegat-plugin-yandex/
