Is it common to just leave out diacritics when dealing with foreign vocabulary in the English language ? I don't know for English, but in French, we comple

Is it common to just leave out diacritics when dealing with foreign vocabulary in the English language ? I don't know for English, but in French, we completely translate the name of some German cities : - Freiburg im Breisgau => Fribourg-en-Brisgau - Aachen => Aix-la-Chapelle - München => Munich