Romani; the language of the Gypsy people. - Addtion: there are many groups of Romani. This dialect is apparently from areas near French/German borders..hence you will hear both French/German influence.
The phrase "you digom les glei in" is not in a known language. It may be a made-up or encrypted phrase. The Zigeli Winter Quartet could be a fictional or lesser-known group, as there is limited information available.