Fix OAuth authorization page and add a spec for it

spec/controllers/about_controller_spec.rb

@@ -1,6 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe AboutController, type: :controller do
+  render_views
 
   describe 'GET #index' do
     it 'returns http success' do
@@ -9,4 +10,10 @@ RSpec.describe AboutController, type: :controller do
     end
   end
 
+  describe 'GET #terms' do
+    it 'returns http success' do
+      get :terms
+      expect(response).to have_http_status(:success)
+    end
+  end
 end