Yes, Flaum will install on a server running Plesk, DirectAdmin, cPanel, or any other control panel so long as the minimal requirements are included.
A web server: Apache (with mod_rewrite), Nginx, or Lighttpd
PHP 5.5+ with the following extensions: mbstring, pdo_mysql, openssl, json, gd, dom, fileinfo
MySQL 5.5+
SSH (command-line) access
You can obtain the Russian language package and information here
https://discuss.flarum.org/d/105-russian-language-pack
There is even a Russian Support site. Details can be found here
https://flarum.today/
