Changing block header link to icon. Setting api response header to match electrs.

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

@@ -116,8 +116,7 @@
                 </tr>
                 <tr>
                   <td i18n="block.header">Block Header Hex</td>
-                  <td><a target="_blank" href="/api/block/{{block.id}}/header" title="click to view">view</a> </td>
-                  
+                  <td><a target="_blank" href="/api/block/{{block.id}}/header"><fa-icon [icon]="['fas', 'external-link-alt']" [fixedWidth]="true"></fa-icon></a></td>
                 </tr>
               </tbody>
             </table>