web-ui: small visual improvements

title on tabset was removed on large screens, difficulty was rounded on latest
bloks view, last seen was transformed into moment tags in masternodes view

web-ui/src/app/components/latest-blocks/latest-blocks.component.html

@@ -1,5 +1,5 @@
 <div>
-  <div class="row">
+  <div class="row visible-xs">
     <div class="col-xs-12">
       <h2>{{'label.latestBlocks' | translate}}</h2>
     </div>
@@ -31,7 +31,7 @@
             </td>
             <td>{{item.time * 1000 | amTimeAgo}}</td>
             <td>{{item.transactions.length}}</td>
-            <td>{{item.difficulty}}</td>
+            <td>{{item.difficulty | number:'1.2-2'}}</td>
             <td>{{extractedBy(item) | translate}}</td>
           </tr>
         </tbody>

web-ui/src/app/components/masternodes/masternodes.component.html

@@ -1,5 +1,5 @@
 <div>
-  <div class="row">
+  <div class="row visible-xs">
     <h2 class="col-xs-12">{{'label.masternodes' | translate}}</h2>
   </div>
 
@@ -14,7 +14,7 @@
                 <th class="col-xs-2 col-sm-2 col-md-1 col-lg-1">{{'label.status' | translate}}</th>
                  -->
           <th class="col-xs-2 col-md-1">{{'label.active' | translate}}</th>
-          <th class="col-xs-3 col-md-2">{{'label.lastSeen' | translate}}</th>
+          <th class="col-xs-2">{{'label.lastSeen' | translate}}</th>
           <th class="col-xs-2 col-md-1">{{'label.payee' | translate}}</th>
         </tr>
       </thead>
@@ -28,7 +28,7 @@
                 <td>{{item.status}}</td>
                 -->
           <td>{{Math.max(item.activeSeconds, 0) | amDuration:'seconds'}}</td>
-          <td>{{item.lastSeen * 1000 | date:'MMMM d, y, h:mm:ss a'}}</td>
+          <td>{{item.lastSeen * 1000 | amTimeAgo}}</td>
           <td>
             <a routerLink="/addresses/{{item.payee}}">{{item.payee}}</a>
           </td>

web-ui/src/app/components/richest-addresses/richest-addresses.component.html

@@ -1,5 +1,5 @@
 <div>
-  <div class="row">
+  <div class="row visible-xs">
     <h2 class="col-xs-12">{{'label.richestAddresses' | translate}}</h2>
   </div>