[WIP] [Translation] Add note about how to override translation in child Bundle

#5193

Author: zebba

cookbook/bundles/override.rst

@@ -191,7 +191,10 @@ can override the translations from any translation file, as long as it is in
     The last translation file always wins. That means that you need to make
     sure that the bundle containing *your* translations is loaded after any
     bundle whose translations you're overriding. This is done in ``AppKernel``.
-
+    Translation files are not aware of the inheritance tree and therefore 
+    unaware of their parent. If you want to override translations from the 
+    parent bundle be sure the loading order in ``AppKernel`` is parent > child.
+    
     The file that always wins is the one that is placed in
     ``app/Resources/translations``, as those files are always loaded last.