Label language have switched without any action of us

Hello,

The default label set is English, we change the default label manually.

I'm not the owner for all courses, but we are all in a francophone organisation so I guest everyone is using the french Label.

The courses have differents owners.

You asked if the Default Label was French. Is there a way I can set the default Label for everyone one ( I'm the manager on the account, and I can also ask to the owners account.