I must say that I find that answer a bit strange.
Server O.S. usually never is a problem since 99.9% of the time, English version is used (at least in the Nordics).
Client computers however, 99% of the time, regardless of which country we speak, has native language concerning O.S. installed.
Tell me, could O.S. language version still be a possible show stopper concerning modern O.S. that exist today when a Company like Veeam is developing software ?
I only mean from a technical perspective, not talking about being able to understand English or not.