Would be handy to be able to specify “Language name” as one of the criteria for creating custom filters.
That will require a completely new set of dictionary (e.g. what’s the character set of Polish?). Or did you mean script?
Yes, sorry, I meant “language” in the way it’s used in the middle of the left pane of the font window. Latin/Cyrillic/Greek/Hebrew/Arabic/Chinese/Japanese…
But you can do that already:
In that case, reclassify this from “Feature Suggestion” to “Request for help in seeing what’s obviously already there” 
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What Rainer shows here is a Smart Filter window. Look at the items under the Wheel in the lower-left of the main window for several choices.
Yup, got it now, thanks!