Spell-checking Asciidoc
Can be done on the command line with aspell. Iff you arr Tschörmann, be sure to install your language pack. On Ubuntu, this is done with:
sudo apt install aspell-de
There are also plugins for Atom and VS Code, but I didn’t investigate further, as I am not a regular user of those editors. The one for VS Code is called "Code Spell Checker", it’s language pack is called "German - Code Spell Checker". Google it yourself, if you wanna know more.
To set the language, use the -l (long form `--lang). So, if you are
spellchecking a file in German, use:
aspell check -l de <file>