Add event type and localization to cost object activity provider (#2250)

app/models/activity/cost_object_activity_provider.rb

@@ -21,6 +21,10 @@ class Activity::CostObjectActivityProvider < Activity::BaseActivityProvider
     ]
   end
 
+  def event_type(event, activity)
+    'cost_object'
+  end
+
   def event_title(event, activity)
     "#{l(:label_cost_object)} ##{event['journable_id']}: #{event['cost_object_subject']}"
   end

config/locales/de.yml

@@ -92,6 +92,9 @@ de:
 
   description_date_for_new_rate: "Datum für neuen Satz"
 
+  events:
+    cost_object: "Budget editiert"
+
   group_by_others: "In keiner der Gruppen"
 
   help_click_to_edit: "Hier Klicken zum bearbeiten."

config/locales/en.yml

@@ -92,6 +92,9 @@ en:
 
   description_date_for_new_rate: "Date for new rate"
 
+  events:
+    cost_object: "Budget edited"
+
   group_by_others: "not in any group"
 
   help_click_to_edit: "Click here to edit."