Just realised something rather obvious. This is my site, I can use whatever language I want to post in.
In the past I tried keeping a separate Dutch and German language blog, but that always felt contrived, as most my blog conversations are in English by default. Today I responded to a posting by Heinz in German, and it felt contrived to respond in English. Yet I also wanted to post it here, and not just in his blog’s comments. Added categories for Dutch and German now, and will figure out later if I want to provide separate menu options and feeds for it. Or not.