Presentation (in German) about OpenRailwayMap at GPN (Gulaschprogrammiernacht).
When you submit a post or comment, there is a selection box to indicate what language it is. People can choose what language they do understand to filter out content they can not / are not interested in seeing. OP has selected “English” as the language of a post that is clearly in German.
I would guess they are upset they engaged with a german language post when they set their account to show only their, presumably english, language.
I speak German just fine. It’s for other people. What’s the point of having a language setting if people are just going to stick “English” there?
Because this isnt German local news or something, this is a presentation on the inner workings of the railway map. Might very well be interesting to people regardless of language, you could probably turn off the audio and watch it with subtitles.
On principle you are correct though, the language setting isnt properly used most of the time.