Hi. By default Garmin set workout name in russian language interface to - "Гдень Бег" for running or "Гдень Езда на велосипеде" for cycling.
Here is examples:
https://connect.garmin.com/modern/activity/2034277634
https://connect.garmin.com/modern/activity/2034277634
https://connect.garmin.com/modern/activity/2031752515
https://connect.garmin.com/modern/activity/2035908905
https://connect.garmin.com/modern/activity/2033838468
Threre is no word "Гдень" in russian language. Correct is - "День" (without "Г").
Please fix this misprint.