tweak block preview (height & hash side by side)

frontend/src/app/components/block/block-preview.component.html

@@ -4,15 +4,19 @@
   </app-preview-title>
   <div class="row">
     <div class="col-sm">
-      <div class="row d-flex justify-content-between">
-        <div class="title-wrapper">
+      <div class="row">
+        <div class="block-titles">
           <h1 class="title">
             <ng-template [ngIf]="blockHeight === 0"><ng-container i18n="@@2303359202781425764">Genesis</ng-container></ng-template>
             <ng-template [ngIf]="blockHeight" i18n="shared.block-title">{{ blockHeight }}</ng-template>
           </h1>
+          <h2 class="subtitle" *ngIf="blockHash">
+            {{ blockHash.slice(0,20) }}
+            <br>
+            …{{ blockHash.slice(-19) }}
+          </h2>
         </div>
       </div>
-      <a class="subtitle truncated" [routerLink]="['/block/' | relativeUrl, blockHash]" *ngIf="blockHash"><span class="first">{{blockHash.slice(0,-4)}}</span><span class="last-four">{{blockHash.slice(-4)}}</span></a>
       <table class="table table-borderless table-striped">
         <tbody>
           <!-- <tr>