Misc. typos (#8694)

Found via `codespell -q 3 --skip="./app/javascript/mastodon/locales,./config/locales"`

spec/controllers/emojis_controller_spec.rb

@@ -6,11 +6,11 @@ describe EmojisController do
   let(:emoji) { Fabricate(:custom_emoji) }
 
   describe 'GET #show' do
-    subject(:responce) { get :show, params: { id: emoji.id, format: :json } }
+    subject(:response) { get :show, params: { id: emoji.id, format: :json } }
     subject(:body) { JSON.parse(response.body, symbolize_names: true) }
 
     it 'returns the right response' do
-      expect(responce).to have_http_status 200
+      expect(response).to have_http_status 200
       expect(body[:name]).to eq ':coolcat:'
     end
   end