Translations update from Weblate (#4591)

* [Web] Updated lang.ru.json [CI SKIP]

Co-authored-by: DRago_Angel <alekseev.dmitriy.92@gmail.com>
Co-authored-by: milkmaker <milkmaker@mailcow.de>

* [Web] Updated lang.uk.json [CI SKIP]

[Web] Updated lang.uk.json [CI SKIP]

[Web] Added lang.uk.json [CI SKIP]

Co-authored-by: OGudzik <olegrpg@gmail.com>
Co-authored-by: Oleksii Kruhlenko <a.kruglenko@gmail.com>
Co-authored-by: Peter <magic@kthx.at>
Co-authored-by: milkmaker <milkmaker@mailcow.de>

* [Web] Updated lang.it.json [CI SKIP]

Co-authored-by: Stefano <stefano.vassena@gmail.com>
Co-authored-by: milkmaker <milkmaker@mailcow.de>

* Add Ukrainian language code in vars.inc.php

Co-authored-by: DRago_Angel <alekseev.dmitriy.92@gmail.com>
Co-authored-by: OGudzik <olegrpg@gmail.com>
Co-authored-by: Oleksii Kruhlenko <a.kruglenko@gmail.com>
Co-authored-by: Peter <magic@kthx.at>
Co-authored-by: Stefano <stefano.vassena@gmail.com>