Create scripts/store/getters

scripts/store/getters/group_title.js

@@ -0,0 +1,12 @@
+module.exports = function () {
+  if (this.group_title) return this.group_title
+
+  if (Array.isArray(this.categories)) {
+    return this.categories
+      .map(i => i.name)
+      .sort()
+      .join(';')
+  }
+
+  return ''
+}