Show error message in app view

src/views/app.html

@@ -424,6 +424,7 @@
           <a ng-href="{{ app | applicationLink }}" target="_blank" ng-class="{ 'hand': (app | appIsInstalledAndHealthy) }" ng-click="(app | appIsInstalledAndHealthy) && app.pendingPostInstallConfirmation && postInstallMessage.show(true)">{{ app.label || app.fqdn }} <sup ng-show="app | appIsInstalledAndHealthy"><i class="fas fa-external-link-alt" style="font-size: 12px;"></i></sup></a>
           <br/>
           <span class="text-small">{{ app | installationStateLabel }} {{ app.taskProgressMessage ? ' - ' + app.taskProgressMessage : '' }}</span>
+          <span class="text-small" ng-show="app.error"> : {{ app.error.reason + ' - ' + app.error.message }}</span>
         </h1>
         <div>
           <div class="dropdown">