Comment 2 for bug 1824998

Yes, the string is upstream.
Yes, upstream was importing errors from Red Hat translators. I think is related with the Copy Trans feaure of Zanata.
I reported this issue upstream a few minutes after reporting in Launchpad and here is his reply:

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/issues/160

I also contacted one of the developers of Zanata: Sachin Pathare.

https://github.com/orgs/zanata/people

Summary:

"NetworkManager upstream does not use Zanata.
We had a project at zanata.org [1], but that had severe issues, so we are back to po-files and git."

"Red Hat uses Zanata internally, but afterwards they get manualy import the plain "po" file in git. Whatever Red Hat translators do, what matters is only what we import.
The only upstream location for translations is git (and that's also the place to contribute translations)."