In a HtmlArea, select a word with Norwegian characters and klick “insert/edit link”. The “Text”-field will replace the Norwegian characters with HTML entities representing said characters.
Example:
Trøndelag -> Trøndelag
When saving the link, the text in the HtmlArea now displays the escaped characters instead.
I’ve had this reported in too. Didn’t manage to verify it, but I typed the åæø text only in the “popup” (didn’t select any text beforehand). So looks like a missing un-escape on the selected text before being sent to the “popup” dialog.