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Hi M.Knoppert,
The default language of a SharePoint site is defined when the site collection is created. For the users’ OneDrive for Business which is part of the user’s personal site (MySite), the default language is same to the MySite Host which depends on the language you selected when signing up your Office 365 tenant. This language setting can’t be changed afterwards.
Given the situation, we suggest you ask your users to change the language by themselves. Here is an article about two to change the language settings I’d like to share with you: Change your language and region settings.
Best Regards,
Eric Yang