> Yes, the language is not the issue, the issue is that it isn't English.
Take it a step further.
The issue is that the value of the commit messages has been lost or degraded because they are not understandable to the maintainers and development team.
The same issue would (presumably) be raised if it were in German, Caesar cipher, English in random alternate UTF characters, formatted in some weird way that substantially reduced utility, or even just borderline unintelligible English.
(And if that’s _not_ the case, then this _is_ an issue on your end and I’d say you’re in the wrong. Ignore the rest.)
I’m guessing you’re worried about coming across as a dick because in your framing this is veering into language, culture, and all sorts of other things where some sensitivity should be employed. It doesn’t need to go there, though.
The focus is the utility the messages provide, that you value that utility, and that this does not provide that utility. In that sense it’s no different than asking someone to update a PR to include documentation updates, add comments to their code, or something similar.