You mean this forum? It's phpBB.2. What forum does your CMS work on?
You can add it to /panel/settings-schema.json, but you will need to refresh your browser cache if you do so. I will add it myself to next official X3 release.But there is a problem.
There is no Russian language in the admin panel.
"language": { "type": "string", "title": "Panel Language", "enum": [ "English", "French", "German", "Russian" ]}
key_buffer_size = 64Mmax_allowed_packet = 128Mread_buffer_size = 1Mread_rnd_buffer_size = 4Msort_buffer_size = 32M