Added missing translation strings

Update German Translation

cps/helper.py

@@ -805,7 +805,7 @@ def save_cover_from_url(url, book_path):
             img = advocate.get(url, timeout=(10, 200), allow_redirects=False)      # ToDo: Error Handling
         else:
             log.error("python module advocate is not installed but is needed")
-            return False, _("Python module 'advocate' is not installed but is needed for cover downloads")
+            return False, _("Python module 'advocate' is not installed but is needed for cover uploads")
         img.raise_for_status()
         return save_cover(img, book_path)
     except (socket.gaierror,

cps/templates/grid.html

@@ -18,7 +18,7 @@
         <div class="btn btn-primary char">{{char.char}}</div>
         {% endfor %}
       </div>
-        <div class="update-view btn btn-primary" data-target="series_view" id="list-button" data-view="list">List</div>
+        <div class="update-view btn btn-primary" data-target="series_view" id="list-button" data-view="list">{{_('List')}}</div>
     </div>
 
     {% if entries[0] %}

cps/templates/list.html

@@ -19,7 +19,7 @@
       </div>
 
       {% if data == "series" %}
-      <button class="update-view btn btn-primary" data-target="series_view" id="grid-button" data-view="grid">Grid</button>
+      <button class="update-view btn btn-primary" data-target="series_view" id="grid-button" data-view="grid">{{_('Grid')}}</button>
       {% endif %}
     </div>
   <div class="container">