This field does not allow me to select a language for the spelling checker. What else do I need to install? Additional German language packages for Plasma are all already installed.
Mine is also empty too on English language.
OK, not that I need a spell check, but I don’t like it when something is half-finished. I assume there is some module that needs to be installed, but which one? Ich habe meine Standardsprache schon installiert:
Spectacle refuses to record only the active window right now 
Click on spell check and then help and maybe you can figure it out?
Edit: I’m not actually sure where the spell check is used?
You need to install Hunspell (or another spell checker) and also the appropriate dictionaries for any languages you use.
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I installed Aspell-ru and I have a choice of Russian language in the KDE settings.
I have only English language installed and Hunspell is installed. How & where does the spell check work?
I think you need to also install a dictionary - hunspell-en_US in my case.
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I think i had done this before. You would think this should be something that is done automatically? 
That’s something to ask the devs here, I suppose.
I was more thinking on the KDE side.
Or them.
The solution is: install hunspell-de (in case of german), then the language is available for selection.
Thanks to all who have tried to help 
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Yup, hunspell-(insert language) works.
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