Enhanced the Collapse all or Expand All button by implementing both in the same button and also fix the translation for both

src/app/shared/common-logic/tree-control.service.ts

@@ -0,0 +1,19 @@
+import { Injectable } from '@angular/core';
+import { NestedTreeControl } from '@angular/cdk/tree';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class TreeControlService {
+  constructor() { }
+
+  toggleExpandCollapse(nestedTreeControl: NestedTreeControl<any>, isTreeExpanded: boolean) {
+    if (isTreeExpanded) {
+      nestedTreeControl.collapseAll();
+    } else {
+      nestedTreeControl.expandAll();
+    }
+    // Toggle the state
+    return !isTreeExpanded;
+  }
+}