I was able to enable translation, but I found one bug.
The error comes out when I enter in my language russian, if english is set by default, then the error does not occur at the url/site.com/oc-admin/index.php?#page=translations
<!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="utf-8">
<title><br />
<b>Fatal error</b>: Uncaught ValueError: Unknown format specifier "�" in C:\OSPanel\domains\localhost\site.com\oc-admin\themes\omega\translations\index.php:50
Stack trace:
#0 C:\OSPanel\domains\localhost\site.com\oc-admin\themes\omega\translations\index.php(50): sprintf()
#1 C:\OSPanel\domains\localhost\site.com\oc-includes\osclass\classes\Plugins.php(69): customPageTitle()
#2 C:\OSPanel\domains\localhost\site.com\oc-includes\osclass\helpers\hPlugins.php(46): Plugins::applyFilter()
#3 C:\OSPanel\domains\localhost\site.com\oc-admin\themes\omega\parts\header.php(6): osc_apply_filter()
#4 C:\OSPanel\domains\localhost\site.com\oc-includes\osclass\helpers\hDefines.php(332): require('C:\\OSPanel\\doma...')
#5 C:\OSPanel\domains\localhost\site.com\oc-admin\themes\omega\translations\index.php(59): osc_current_admin_theme_path()
#6 C:\OSPanel\domains\localhost\site.com\oc-includes\osclass\helpers\hDefines.php(332): require('C:\\OSPanel\\doma...')
#7 C:\OSPanel\domains\localhost\site.com\oc-admin\translations.php(617): osc_current_admin_theme_path()
#8 C:\OSPanel\domains\localhost\site.com\oc-admin\translations.php(608): CAdminTranslations->doView()
#9 C:\OSPanel\domains\localhost\site.com\oc-admin\index.php(165): CAdminTranslations->doModel()
#10 {main}
thrown in <b>C:\OSPanel\domains\localhost\site.com\oc-admin\themes\omega\translations\index.php</b> on line <b>50</b><br />