FIX: EmailValidator needs to validate format of email.

spec/requests/users_email_controller_spec.rb

@@ -282,7 +282,7 @@ describe UsersEmailController do
       it 'raises an error without an invalid email' do
         put "/u/#{user.username}/preferences/email.json", params: { email: "sam@not-email.com'" }
         expect(response.status).to eq(422)
-        expect(response.body).to include("email is invalid")
+        expect(response.body).to include("Email is invalid")
       end
 
       it "raises an error if you can't edit the user's email" do