Remove user fields that can't be interpolated

assets/javascripts/discourse/components/wizard-text-editor.js.es6

@@ -5,6 +5,12 @@ import { scheduleOnce } from "@ember/runloop";
 import Component from "@ember/component";
 import I18n from "I18n";
 
+const excludedUserProperties = [
+  'avatar',
+  'profile_background',
+  'card_background'
+];
+
 export default Component.extend({
   classNames: 'wizard-text-editor',
   barEnabled: true,
@@ -39,7 +45,8 @@ export default Component.extend({
   
   @discourseComputed()
   userPropertyList() {
-    return userProperties.map((f) => ` u{${f}}`);
+    return userProperties.filter((f) => !excludedUserProperties.includes(f))
+      .map((f) => ` u{${f}}`);
   },
   
   @discourseComputed('wizardFields')

assets/stylesheets/common/wizard-admin.scss

@@ -444,6 +444,11 @@
     
     .btn {
       margin-right: 10px;
+      color: $primary;
+      
+      &:hover {
+        color: $secondary;
+      }
     }
     
     .wizard-editor-gutter-popover {