ENYO-3073: Fixed auto-completion on enyo. and onyx.

* ENYO-3073: display error text when error is thrown as string from Enyo
* ENYO-3073: Fixed name collision introduced by enyo on "concat"

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>