tw- upd: fix font on Opera 12

- <html lang="und"/>
- http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
tw- dev: searchable #tag on Opera 12 (if U.ROOT has no `?`)

Opera 12:
example.com/%23foo
location.pathname // "/#foo"

Others:
example.com/%23foo
location.pathname // "/%23foo"