When you browse to the new Sites page in Office 365, the activities for Recent Sites and Recommended Sites are displayed in a language other than the setting that you configured under My Display Languages in your SharePoint Online profile.
This is a known issue that Microsoft is working to resolve. This issue occurs when the Language Preferences setting differs from the Locale setting.
Article ID: 3136544 - Last Review: Dec 29, 2016 - Revision: 1
Microsoft SharePoint Online