#93 Errors via mail

* configures server errors sending via mail
   * default for now is always 'ksp-servicestelle'
* includes improvements from #97

templates/email/sharing/shared_access_given.html

@@ -9,7 +9,7 @@
         <br>
         {% trans 'the following dataset has just been shared with you' %}
         <br>
-        <strong>'{{obj_identifier}}'</strong>
+        <strong>{{obj_identifier}}</strong>
         <br>
         {% trans 'This means you can now edit this dataset.' %}
         {% trans 'The shared dataset appears now by default on your overview for this dataset type.' %}

templates/email/sharing/shared_access_removed.html

@@ -9,7 +9,7 @@
         <br>
         {% trans 'your shared access, including editing, has been revoked for the dataset ' %}
         <br>
-        <strong>'{{obj_identifier}}'</strong>
+        <strong>{{obj_identifier}}</strong>
         <br>
         {% trans 'However, you are still able to view the dataset content.' %}
         {% trans 'Please use the provided search filter on the dataset`s overview pages to find them.' %}