Update HTML parser to allow the lang global attribute

Description

The lang global attribute can be whitelisted for all user-generated HTML content.

For adding lang to our language lists and selectors, see instead.

How to test: check that you can use lang on various HTML tags, and make sure the attribute doesn't get removed, in places such as:

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Assignee

Unassigned

Reporter

CJ Record

Roadmap

Misc

Priority

Medium

Affects versions

Fix versions

None

Components

Parser

Difficulty

Medium

Milestone

Internal 0.9
Configure