Revert "De-implement angular work package column filters"

This reverts commit 4f7bc83dbb.

app/assets/javascripts/angular/filters/column_filters.js

@@ -33,5 +33,26 @@ openprojectApp
           return object[map[option]]();
       }
     };
-  });
+  })
+
+  // work packages
+  .filter('columnContent', function(){
+    return function(object, option) {
+      return object[option]; // TODO formatting by type
+    };
+  })
 
+  .filter('columnNamedChildContent', function(){
+     // TODO RS: This is just a temporary solution to display some text for child objects
+    return function(object, option) {
+      var p = object[option];
+      switch(typeof(p)) {
+        case 'string':
+          return p;
+        case 'object':
+          return p['name'];
+        default:
+          return 'None';
+      }
+    };
+  });