Merge pull request #440 from kinfkong/issue-322

fix issue #322

Author: standlove

src/app/app.component.html

@@ -28,8 +28,8 @@
         <div class="flex1"></div>
         <mat-menu #sideMenu="matMenu">
           <button [disabled]="!currentInstance" mat-menu-item (click)="onRefresh(true)">Refresh + Expand All Nodes</button>
-          <button [disabled]="!currentInstance" mat-menu-item (click)="onImport(currentInstance)">Import</button>
-          <button [disabled]="!currentInstance" mat-menu-item (click)="onExport(currentInstance)">Export</button>
+          <button [disabled]="!currentInstance" mat-menu-item (click)="onImport(currentInstance)">Import Data</button>
+          <button [disabled]="!currentInstance" mat-menu-item (click)="onExport(currentInstance)">Export Data</button>
         </mat-menu>
         <button mat-icon-button matTooltip="Settings" (click)="onSettingsEvt()" onclick="this.blur()" ><i class="material-icons">settings</i></button>
         <button mat-icon-button matTooltip="More" [matMenuTriggerFor]="sideMenu">