EZP-29788: As a developer, I want to delete content type translation …

…(#2494)

* EZP-29788: As a developer, I want to delete content type translation

* EZP-29788: Move handling into persistence layer

* EZP-29788: Code review fix

* EZP-29788: Unit tests for new removeContentTypeTranslation method

* EZP-29788: BC breaks doc updated

* EZP-29788: Changed typehinting for contentTypeId from mixed to int

Persistence/Content/Type/Handler.php

@@ -322,4 +322,12 @@ public function publish($contentTypeId);
      * @return array
      */
     public function getSearchableFieldMap();
+
+    /**
+     * @param int $contentTypeId
+     * @param string $languageCode
+     *
+     * @return \eZ\Publish\SPI\Persistence\Content\Type
+     */
+    public function removeContentTypeTranslation(int $contentTypeId, string $languageCode): Type;
 }