Add date-fns locale for Spanish language

client/src/locales/index.js

@@ -3,6 +3,7 @@ import fromPairs from 'lodash/fromPairs';
 import cs from './cs/embed';
 import de from './de/embed';
 import en from './en/embed';
+import es from './es/embed';
 import fr from './fr/embed';
 import pl from './pl/embed';
 import ru from './ru/embed';
@@ -11,6 +12,7 @@ const localePairs = [
   ['cs', cs],
   ['de', de],
   ['en', en],
+  ['es', es],
   ['fr', fr],
   ['pl', pl],
   ['ru', ru],