[luci] ampersand character in HTML

[Jo-Philipp Wich]

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Hi.

If your characters got replaced with "?" then the system detected an
invalid UTF-8 sequence. You must make sure that everything you use is
UTF-8 encoded. If you are sure that it is UTF-8 and you still see "?"
chars then send me an example please so that I can look into it.

~ Jow
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