Install the plugin. When you open the backend error occurs.
Unable to choose a translation for "Campaign|Campaigns" with locale "ru" for value "0". Double check that this translation has the correct plural options (e.g. "There is one apple|There are %count% apples").
/home/i/***/public_html/vendor/symfony/translation/MessageSelector.php line 83
Help solve the problem.
Thanks in advance for your help.