Add showcase for first string translation

src/translation/de.json

@@ -0,0 +1,3 @@
+{
+    "MY_APPS": "Meine Apps"
+}

src/translation/en.json

@@ -0,0 +1,4 @@
+{
+    "MY_APPS": "My Apps",
+    "CLOUDRON_OFFLINE": "Cloudron is offline. Reconnecting…"
+}

src/translation/fr.json

@@ -0,0 +1 @@
+{}

src/views/apps.html

@@ -112,7 +112,7 @@
 
     <div class="animateMeOpacity ng-hide" ng-show="installedApps.length > 0">
       <h1 class="view-header">
-        My Apps
+        {{ 'MY_APPS' | translate }}
         <div class="pull-right">
           <form class="form-inline">
             <input type="text" class="form-control" ng-show="installedApps.length > 8" placeholder="Search Apps" id="appSearch" ng-model="appSearch"/>