It makes Admin's life easier to filter users by various status.
* introduce window.config.PageData to pass template data to javascript module and small refactor
move legacy window.ActivityTopAuthors to window.config.PageData.ActivityTopAuthors
make HTML structure more IDE-friendly in footer.tmpl and head.tmpl
remove incorrect <style class="list-search-style"></style> in head.tmpl
use log.Error instead of log.Critical in admin user search
* use LEFT JOIN instead of SubQuery when admin filters users by 2fa. revert non-en locale.
* use OptionalBool instead of status map
* refactor SearchUserOptions.toConds to SearchUserOptions.toSearchQueryBase
* add unit test for user search
* only allow admin to use filters to search users
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