rsync error messages always in English (= never translated)?

[rsync at altfeld-im.de]

I want to recognize and handle some rsync error messages
in my log files (containing also the --itemize-changes output)
on different computers with different language/locale settings.

Can I rely on rsync to create only English error messages
to have a stable pattern to recognize?

PS: In the source code at https://github.com/WayneD/rsync I could not see
any indication of message translations...