HTML5 template: conditionally include lang attribute.

Previously we included it unconditionally, even if this
meant giving it an empty value.  This seems at best redundant,
since the empty value is the default. At worst, it adds clutter
and according to some sources may prevent the use of browser defaults.

I believe that the justification for including these attributes
even with empty values is not a good one; see commit 07d51d9
for the original change.  On my reading, the HTML spec does not
require the presence of the attribute on the html element; it
only says that if the attribute is present, it must have an
empty string or valid BCP 47 language tag as its value.

See also #11324.

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