* Fix#3910 - Require OTP authentication to disable 2FA. Also, remove ability
to generate new OTP backup codes *after* initial backup codes were handed
out during activation
* Restore recovery code re-generation
* Improve display of some 2FA elements
* Replace will_paginate with kaminari
* Use #page instead of #paginate in controllers
* Replace will_paginate.page_gap with pagination.truncate in i18n
* Customize kaminari views to match prior styles
* Set kaminari options to match prior behavior
* Replace will_paginate with paginate in views