working on the task index page

next:
* creating links to open/close/abort tasks
* link to task/X/edit should show settings

translations/src/main/resources/de.json

@@ -223,6 +223,7 @@
   "tag_uses": "Verwendung des Tags „{tag}“",
   "tags": "Tags",
   "task": "Aufgabe",
+  "task_list": "Aufgabenliste",
   "tasks": "Aufgaben",
   "tax_id": "Steuernummer",
   "tax_rate": "Steuersatz",