Extracted Annotations with Multiple Language
Can the "Note" created by the extracted annotations be formatted to recognize and display multiple languages?
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Upgrade Storage
For the spellchecker, that has nothing to do with extracted annotations; it's currently English only. You can disable it:
https://forums.zotero.org/discussion/19771/workaround-to-disable-spell-checker/p1
or you can, with some more work, have it work in a different language, but I believe only one at a time: https://forums.zotero.org/discussion/71817/spellcheck-in-non-english-languages-done-workaround/p1