diff --git a/core/ajax/vcategories/add.php b/core/ajax/vcategories/add.php
index 81fa06dbf1..e97612c28f 100644
--- a/core/ajax/vcategories/add.php
+++ b/core/ajax/vcategories/add.php
@@ -15,23 +15,26 @@ function debug($msg) {
 }
 
 require_once '../../../lib/base.php';
-OC_JSON::checkLoggedIn();
-$category = isset($_GET['category'])?strip_tags($_GET['category']):null;
-$app = isset($_GET['app'])?$_GET['app']:null;
 
-if(is_null($app)) {
-	bailOut(OC_Contacts_App::$l10n->t('Application name not provided.'));
+OCP\JSON::checkLoggedIn();
+OCP\JSON::callCheck();
+
+$l = OC_L10N::get('core');
+
+$category = isset($_POST['category']) ? strip_tags($_POST['category']) : null;
+$type = isset($_POST['type']) ? $_POST['type'] : null;
+
+if(is_null($type)) {
+	bailOut($l->t('Category type not provided.'));
 }
 
-OC_JSON::checkAppEnabled($app);
-
 if(is_null($category)) {
-	bailOut(OC_Contacts_App::$l10n->t('No category to add?'));
+	bailOut($l->t('No category to add?'));
 }
 
 debug(print_r($category, true));
 
-$categories = new OC_VCategories($app);
+$categories = new OC_VCategories($type);
 if($categories->hasCategory($category)) {
 	bailOut(OC_Contacts_App::$l10n->t('This category already exists: '.$category));
 } else {
diff --git a/core/ajax/vcategories/delete.php b/core/ajax/vcategories/delete.php
index cd46a25b79..fd7b71be5d 100644
--- a/core/ajax/vcategories/delete.php
+++ b/core/ajax/vcategories/delete.php
@@ -16,21 +16,25 @@ function debug($msg) {
 }
 
 require_once '../../../lib/base.php';
-OC_JSON::checkLoggedIn();
-$app = isset($_POST['app'])?$_POST['app']:null;
-$categories = isset($_POST['categories'])?$_POST['categories']:null;
-if(is_null($app)) {
-	bailOut(OC_Contacts_App::$l10n->t('Application name not provided.'));
+
+OCP\JSON::checkLoggedIn();
+OCP\JSON::callCheck();
+
+$l = OC_L10N::get('core');
+
+$type = isset($_POST['type']) ? $_POST['type'] : null;
+$categories = isset($_POST['categories']) ? $_POST['categories'] : null;
+
+if(is_null($type)) {
+	bailOut($l->t('Object type not provided.'));
 }
 
-OC_JSON::checkAppEnabled($app);
-
-debug('The application "'.$app.'" uses the default file. OC_VObjects will not be updated.');
+debug('The application using category type "' . $type . '" uses the default file for deletion. OC_VObjects will not be updated.');
 
 if(is_null($categories)) {
-	bailOut('No categories selected for deletion.');
+	bailOut($l->t('No categories selected for deletion.'));
 }
 
-$vcategories = new OC_VCategories($app);
+$vcategories = new OC_VCategories($type);
 $vcategories->delete($categories);
 OC_JSON::success(array('data' => array('categories'=>$vcategories->categories())));
diff --git a/core/ajax/vcategories/edit.php b/core/ajax/vcategories/edit.php
index a0e67841c5..4e9c9c17b5 100644
--- a/core/ajax/vcategories/edit.php
+++ b/core/ajax/vcategories/edit.php
@@ -17,16 +17,19 @@ function debug($msg) {
 
 require_once '../../../lib/base.php';
 OC_JSON::checkLoggedIn();
-$app = isset($_GET['app'])?$_GET['app']:null;
 
-if(is_null($app)) {
-	bailOut('Application name not provided.');
+$l = OC_L10N::get('core');
+
+$type = isset($_GET['type']) ? $_GET['type'] : null;
+
+if(is_null($type)) {
+	bailOut($l->t('Category type not provided.'));
 }
 
-OC_JSON::checkAppEnabled($app);
-$tmpl = new OC_TEMPLATE("core", "edit_categories_dialog");
+OC_JSON::checkAppEnabled($type);
+$tmpl = new OCP\Template("core", "edit_categories_dialog");
 
-$vcategories = new OC_VCategories($app);
+$vcategories = new OC_VCategories($type);
 $categories = $vcategories->categories();
 debug(print_r($categories, true));
 $tmpl->assign('categories', $categories);