Merge headline and app description into one paragraph

packages/app-shell/src/i18n/de/translation.json

@@ -10,6 +10,6 @@
     "hello-world": "Hallo Welt"
   },
   "welcome": {
-      "headline": "Willkommen bei der Applikation '{{appname}}'"
+      "headline": "Willkommen bei der Applikation '{{appname}}'."
   }
 }
\ No newline at end of file

packages/app-shell/src/i18n/en/translation.json

@@ -10,6 +10,6 @@
     "hello-world": "Hello World"
   },
   "welcome": {
-      "headline": "Welcome to the '{{appname}}' application"
+      "headline": "Welcome to the '{{appname}}' application."
   }
 }

packages/app-shell/src/vpu-app-shell-welcome.js

@@ -62,8 +62,8 @@ class AppShellWelcome extends ScopedElementsMixin(LitElement) {
         }
 
         return html`
-            <p>${i18n.t('welcome.headline', {appname: app.topic.name[this.lang]})}</p>
-            <p>${app.topic.description[this.lang] }</p>
+            <p>${i18n.t('welcome.headline', {appname: app.topic.name[this.lang]})}
+            ${app.topic.description[this.lang] }.</p>
             <br>
             ${itemTemplates}
         `;