Re: [webcomponents] lang and xml:lang should not use the flat tree (#385)

@kojiishi if it's just a control that might be okay (though in that case the control will also need to be able to adapt based on the language and direction inputs it gets), but if it's also content it gets a little weird. Now perhaps if you include content the advice would be to always include these attributes yourself since you might get overwritten, but if the majority is en/ltr that will not get noticed much.

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