🌐(i18n) add spanish and chinese (#884)

All the spanish and chinese translations are complete on crowdin. We
activate it in django settings and download all translations from
crowdin

Signed-off-by: virgile-deville <virgile.deville@beta.gouv.fr>

src/frontend/apps/e2e/__tests__/app-impress/common.ts

@@ -15,6 +15,8 @@ export const CONFIG = {
     ['fr-fr', 'Français'],
     ['de-de', 'Deutsch'],
     ['nl-nl', 'Nederlands'],
+    ['es-es', 'Spanish'],
+    ['cn-cn', 'Chinese'],
   ],
   LANGUAGE_CODE: 'en-us',
   POSTHOG_KEY: {},