Comment 4 for bug 350556

May be it is feasible to add a declaration for a page's langauge somewhere in the head(er).

Similarly, a paragraph's or line's language might be set by putting something like ":de:" at the start of the content (using something like "* :de:" for lists or ""=== :de:" for headlines.

This might even make it possible to exclude text from spellchecking (e.g. ":none:") or change the language several times within a line, e.g. "The word 'house' in several languages: German: :de: 'Haus', Dutch: :nl: 'huis', French :fr: 'maison', ..."