Hi James,
For what i remember, the "Advanced" word used is a common one defined globally for Moodle ("advanced" string in /lang/en/moodle.php).
It could/should be changed for a dedicated string, allowing it to be customized with no risk to break things elsewhere.
I'm really not a specialist, but i think used string is defined in /mod/forum/templates/inpage_reply.mustache
Séverin
Forum
Moodle 3.7 - Reply inline and "Advanced" editor mode
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