Shorten tx diagram toggle labels

frontend/src/app/components/transaction/transaction.component.html

@@ -195,7 +195,7 @@
         <h2 id="flow" i18n="transaction.flow|Transaction flow">Flow</h2>
       </div>
 
-      <button type="button" class="btn btn-outline-info flow-toggle btn-sm float-right" (click)="toggleGraph()" i18n="hide-flow-diagram">Hide flow diagram</button>
+      <button type="button" class="btn btn-outline-info flow-toggle btn-sm float-right" (click)="toggleGraph()" i18n="hide-diagram">Hide diagram</button>
 
       <div class="clearfix"></div>
 
@@ -234,7 +234,7 @@
       </div>
 
       <div class="title-buttons">
-        <button *ngIf="!showFlow" type="button" class="btn btn-outline-info flow-toggle btn-sm" (click)="toggleGraph()" i18n="show">Show flow diagram</button>
+        <button *ngIf="!showFlow" type="button" class="btn btn-outline-info flow-toggle btn-sm" (click)="toggleGraph()" i18n="show-diagram">Show diagram</button>
         <button type="button" class="btn btn-outline-info btn-sm" (click)="txList.toggleDetails()" i18n="transaction.details|Transaction Details">Details</button>
       </div>
     </div>