The translatable messages of this extension mention Google+. I'm not an expert on this API, but from what I heard, the Google+ brand is retired. Is it still right to mention Google+ in the messages?
Topic on Extension talk:GoogleLogin
I believe you may be bold and provide a patch set removing Google+ from the messages.
It doesn't feel totally right... I could just replace "Google+" with "Google", but I'm not familiar at all with the API in question. Is it actually the same? Maybe the extension doesn't actually work with the current API? It's better if someone with relevant knowledge does it.
I was not sure about the exact message in question. Thank you for elaborating. Anyhow, it sounds like a task at Phabricator should be filed.
I am not sure if this extension is still being maintained, though. Moving to the PluggableAuth and OpenID Connect extension combo is probably better, but this is another story.