Change string concatenation to template literal

packages/mermaid/src/dagre-wrapper/clusters.js

@@ -184,15 +184,13 @@ const roundedWithTitle = (parent, node) => {
   // Center the label
   label.attr(
     'transform',
-    'translate(' +
-      (node.x - bbox.width / 2) +
-      ', ' +
-      (node.y -
+    `translate(${node.x - bbox.width / 2}, ${
+      node.y -
       node.height / 2 -
       node.padding / 3 +
-        (evaluate(siteConfig.flowchart.htmlLabels) ? 5 : 3)) +
-      subGraphTitleTopMargin +
-      ')'
+      (evaluate(siteConfig.flowchart.htmlLabels) ? 5 : 3) +
+      subGraphTitleTopMargin
+    })`
   );
 
   const rectBox = rect.node().getBBox();