Hi @falagor!
This user action on quad bike will comeback in next Arma 3 update, in honor of this let's correct russian translation. For now translated as the name of the quad bike trick, please make this change:
| key | now | change to |
| str_a3_cfgvehicles_quadbike_01_base_f_useractions_pressxtoflipthequad0 | Кувырок на квадроцикле | Перевернуть квадроцикл |