Allow renaming the Oauth2 login link?

[poVoq]

Right now the name on the button seems to be hard-coded.

So even though I am using Forgejo it says Gitea on the button, which is a bit confusing.

But ideally it would just allow to put a custom name there, as users might not necessarily know what "Gitea" or "Forgejo" is either and I would prefer putting the name of the actual main site there.

Thanks!