Hello!
2. Saving to a folder is currently possible in the Desktop and Android versions, but not in the browser version.
1. There is a DE language, but it is named as "German". I was also confused by this name, but it is present in many lists of languages that I have seen. "Dutch" is listed as "NL Nederlands"
I don't know why this classification, if there is a mistake then I need help understanding this problem in order to fix it.