I have document that was created in Pages for Mac with the correct spelling/language (not English) settings for each paragraph. However, when I now try to edit this document using Pages for iCloud the spelling is set to English.
I have read several support documents about this
as well as some "third party" suggestions, all to no avail.
I have made sure that the correct language is my primary language in my browser (Chrome), in my OS (Win 10), changed the language of the iCloud UI (through Settings), changed the format used by iCloud (also via Settings) but my document is still spelled in English.
I believe the first link above explains how one create a completely new document in a certain language but my document already exists.
How do I change the language used for spell-check on an existing document?