🌐(i18n) remove chinese language

We're going to make languages ​​configurable
per instance, but until we manage that, we're going
to remove Chinese from the default language list.

- Remove the chinese language from the default language
list.
- Change Spanish to Español

src/backend/impress/settings.py

@@ -239,8 +239,7 @@ class Base(Configuration):
             ("fr-fr", "Français"),
             ("de-de", "Deutsch"),
             ("nl-nl", "Nederlands"),
-            ("es-es", "Spanish"),
-            ("cn-cn", "Chinese"),
+            ("es-es", "Español"),
         )
     )