Hi Iuliia, the time the first creation of the teams group should be related to how often the cron job is set to run on your Moodle copy, in my experience it has been from a few minutes to 15 minutes. The language options should not effect if and how the plugin will work (however, there is no Russian translation for the notifications, I think). There is no notification on Moodle when the teams group is created - there is only a notification in Teams. Someone else also wrote they are having trouble with this plugin but unfortunately I haven't had time to really look into this.
General plugins
Plugin local_courseteam
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