* Use HTTP Accept-Language to detect locale
* Fix gem order to comply with codeclimate
* Sort gem to comply with rubocop
* I18n.default_locale fallback when there is no accept-language header
Setting of locale in controller extracted to Localized concern,
the doorkeeper authorized applications controller moved under
custom namespace with inclusion of Localized, which resolves the
"it sometimes appears in a different random language" bug
David Authier
Eugen Rochko