Add description to heading block widget

app/javascript/spotlight/admin/blocks/heading_block.js

@@ -0,0 +1,7 @@
+SirTrevor.Blocks.Heading = (function () {
+  return SirTrevor.Blocks.Heading.extend({
+    editorHTML: function() {
+      return `<p>${i18n.t("blocks:heading:description")}</p><hr><h2 class="st-required st-text-block st-text-block--heading" contenteditable="true"></h2>`;
+    }
+  });
+})();

app/javascript/spotlight/admin/index.js

@@ -27,6 +27,7 @@ import 'spotlight/admin/blocks/block'
 import 'spotlight/admin/blocks/resources_block' // This is a base class of several other blocks, so must come first
 import 'spotlight/admin/blocks/browse_block'
 import 'spotlight/admin/blocks/browse_group_categories_block'
+import 'spotlight/admin/blocks/heading_block'
 import 'spotlight/admin/blocks/iframe_block'
 import 'spotlight/admin/blocks/link_to_search_block'
 import 'spotlight/admin/blocks/oembed_block'

app/javascript/spotlight/admin/sir-trevor/locales.js

@@ -16,6 +16,10 @@ SirTrevor.Locales.en.blocks = $.extend(SirTrevor.Locales.en.blocks, {
     item_counts: "Include category item counts?"
   },
 
+  heading: {
+    description: "This widget produces an H2 heading"
+  },
+
   link_to_search: {
     title: "Saved Searches",
     description: "This widget highlights saved searches. Each highlighted saved search links to the search results page generated by the saved search parameters. Any saved search listed on the Curation > Browse categories page, whether published or not, can be highlighted as a saved search.",