8.5
docs: Fix capitalization mistakes.
Add test coverage for parsers in tools/lib.
capitalization: Prune unused phrases from IGNORED_PHRASES.
queue_processors: Drop unused current_queue_size, which was local size.
python: Normalize quotes with Black.
dead code: Kill off most of html_branches.
check-templates: Check Django/Handlebars templates differently.
mypy: Enable new error explicit-override.