Auto merge of #25629 - pshaughn:reflect_translate, r=jdm

Implement "translate" attribute

This attribute is almost a straightforward enumerated one, but the getter value inherits from parents when the content attribute is absent, even when the parents are non-HTML elements. This initial commit is using LocalName::from on a static string; once html5ever has a release with "translate" in the built-in local name list, a small change will be needed.

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