Merge pull request #1675 from consul/registration-polish

Removes unused validation

app/assets/javascripts/registration_form.js.coffee

@@ -9,7 +9,7 @@ App.RegistrationForm =
       $("small").remove()
 
     showUsernameMessage = (response) ->
-      klass = if response.available then "error no-error" else "error error"
+      klass = if response.available then "no-error" else "error"
       usernameInput.after $("<small class=\"#{klass}\" style=\"margin-top: -16px;\">#{response.message}</small>")
 
     validateUsername = (username) ->

app/models/user.rb

@@ -42,9 +42,6 @@ class User < ActiveRecord::Base
   validates :official_level, inclusion: {in: 0..5}
   validates :terms_of_service, acceptance: { allow_nil: false }, on: :create
 
-  validates :locale, inclusion: {in: I18n.available_locales.map(&:to_s),
-                                 allow_nil: true}
-
   validates_associated :organization, message: false
 
   accepts_nested_attributes_for :organization, update_only: true