rename 'is_support' to 'contains_messages'

app/assets/javascripts/discourse/components/category-chooser.js.es6

@@ -21,7 +21,7 @@ export default ComboboxView.extend({
     return categories.filter(c => {
       if (scopedCategoryId && c.get('id') !== scopedCategoryId && c.get('parent_category_id') !== scopedCategoryId) { return false; }
       if (c.get('isUncategorizedCategory')) { return false; }
-      if (c.get('is_support')) { return false; }
+      if (c.get('contains_messages')) { return false; }
       return c.get('permission') === Discourse.PermissionType.FULL;
     });
   },

app/assets/javascripts/discourse/controllers/topic.js.es6

@@ -81,8 +81,8 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
   @computed("model.isPrivateMessage", "model.category_id")
   showCategoryChooser(isPrivateMessage, categoryId) {
     const category = Discourse.Category.findById(categoryId);
-    const isSupport = category && category.get("is_support");
-    return !isPrivateMessage && !isSupport;
+    const containsMessages = category && category.get("contains_messages");
+    return !isPrivateMessage && !containsMessages;
   },
 
   actions: {

app/assets/javascripts/discourse/models/category.js.es6

@@ -86,7 +86,7 @@ const Category = RestModel.extend({
         custom_fields: this.get('custom_fields'),
         topic_template: this.get('topic_template'),
         suppress_from_homepage: this.get('suppress_from_homepage'),
-        is_support: this.get("is_support"),
+        contains_messages: this.get("contains_messages"),
       },
       type: this.get('id') ? 'PUT' : 'POST'
     });

app/assets/javascripts/discourse/models/composer.js.es6

@@ -71,8 +71,8 @@ const Composer = RestModel.extend({
   showCategoryChooser(isPrivateMessage, hasOptions, categoryId) {
     const manyCategories = Discourse.Category.list().length > 1;
     const category = Discourse.Category.findById(categoryId);
-    const isSupport = category && category.get("is_support");
-    return !isPrivateMessage && !isSupport && (hasOptions || manyCategories);
+    const containsMessages = category && category.get("contains_messages");
+    return !isPrivateMessage && !containsMessages && (hasOptions || manyCategories);
   },
 
   privateMessage: function(){

app/assets/javascripts/discourse/templates/components/edit-category-settings.hbs

@@ -22,8 +22,8 @@
 {{#if emailInEnabled}}
   <section class='field'>
     <label>
-      {{input type="checkbox" checked=category.is_support}}
-      {{i18n 'category.email_in_allow_strangers'}}
+      {{input type="checkbox" checked=category.contains_messages}}
+      {{i18n 'category.contains_messages'}}
     </label>
   </section>
   <section class='field'>