Your reasoning is excellent -- it's only your basic assumptions that are wrong. ...
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as
ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
48769 NEW --- nor Sisyphus grub egori sem Строка в бутменю "Для запуска системы выберите пункт меню и нажмите Enter" всегда на русском языке (UEFI)
60451 ASSI --- nor Sisyphus grub egori jqt4 Отсутствует перевод названий "ALT Domain", "ALT Domain IPA"

File a new bug in the "grub" component of the "Sisyphus" product