I can at least explain the error you're getting: when you edit any page,
MediaWiki includes a hidden form field with the text 'ℳ𝒲♥𝓊𝓃𝒾𝒸ℴ𝒹ℯ'
in the edit form. If this value doesn't arrive when you submit the form,
it displays that error and prevents you from saving the edit to avoid
corrupting pages. The error assumes your browser corrupted that text,
but I guess it's also possible that your server or configuration might
do it…
Try to see what happens when you try to save that text into a page.
Maybe you'll get some more enlightening error. Or at least you'll have
an easy-to-reproduce issue so that you can report this bug elsewhere ;)
--
Bartosz Dziewoński
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