fixed translation key, enforced moderation setting schema

client/coral-plugin-commentbox/CommentBox.js

@@ -120,7 +120,7 @@ class CommentBox extends Component {
                 cStyle={!length || (charCount && length > charCount) ? 'lightGrey' : 'darkGrey'}
                 className={`${name}-button`}
                 onClick={this.postComment}>
-                {lang.t('POST')}
+                {lang.t('post')}
               </Button>
             )
           }

graph/typeDefs.js

@@ -97,8 +97,13 @@ type ActionSummary {
   current_user: Action
 }
 
+enum MODERATION_MODE {
+  PRE
+  POST
+}
+
 type Settings {
-  moderation: String
+  moderation: MODERATION_MODE!
   infoBoxEnable: Boolean
   infoBoxContent: String
   closeTimeout: Int