Presentation (in German) about OpenRailwayMap at GPN (Gulaschprogrammiernacht).
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.