I have a problem with the export to xlsx, with umlauts ä, ö, ü, in the German language. All umlauts are displayed correctly only with textarea and textarea with WYSIWYG not.
example: "Radwegüberfahrt" must be "Radwegüberfahrt"
In Heading "Ausführung" it is decoded correctly.
I find the code unfortunately no clue. Maybe you can help me?
Many Thanks