Delete items by introducing a deleted state

When deleting items via the http api, they are not deleted anymore but
a new status "Deleted" is set. The collective insights contains now a
count separately for deleted items.

modules/webapp/src/main/elm/Messages/Basics.elm

@@ -15,6 +15,7 @@ module Messages.Basics exposing
 type alias Texts =
     { incoming : String
     , outgoing : String
+    , deleted : String
     , tags : String
     , items : String
     , submit : String
@@ -51,6 +52,7 @@ gb : Texts
 gb =
     { incoming = "Incoming"
     , outgoing = "Outgoing"
+    , deleted = "Deleted"
     , tags = "Tags"
     , items = "Items"
     , submit = "Submit"
@@ -92,6 +94,7 @@ de : Texts
 de =
     { incoming = "Eingehend"
     , outgoing = "Ausgehend"
+    , deleted = "Gelöscht"
     , tags = "Tags"
     , items = "Dokumente"
     , submit = "Speichern"

modules/webapp/src/main/elm/Page/CollectiveSettings/View2.elm

@@ -171,6 +171,7 @@ viewInsights texts flags model =
             [ stats (String.fromInt (model.insights.incomingCount + model.insights.outgoingCount)) texts.basics.items
             , stats (String.fromInt model.insights.incomingCount) texts.basics.incoming
             , stats (String.fromInt model.insights.outgoingCount) texts.basics.outgoing
+            , stats (String.fromInt model.insights.deletedCount) texts.basics.deleted
             ]
         ]
     , div