Improve display_history for l10n_status

* fix up/no-change/down detection so it works correctly
* add no-change (prints yellow)
* mark movement for locales as well as highlighted locales
* move some duplicated code into a function
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Fix bug in repr for survey
Add SurveyAdmin
Overhaul hb docs per Gregg's comments
Nix commented out throttle code
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Updated docs