Symfony yaml escapin

Templates:
  NiKoTemplate:
    users_id: NiKo
    title: Mon modele de quatre pages
    description: Un 4 volets reliure incluse
    xml_content: <?xml version="1.0" encoding="utf-8"?><ad:document xmlns:ad="http://www.fluedis.com/ns/AgileDocument" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="AgileDocument.xsd" hd-width="210mm" hd-height="297mm" ld-width="210mm" ld-height="297mm"><ad:page number="1"/><ad:page number="2"/><ad:page number="3"/><ad:page number="4"/></ad:document>
    nb_pages: 4
    width: 210
    height: 297
    print_margin: 15
    paper_format: A4
    envelop_format: A4
    administrative_cost: 10
    displayed_label:
    base_price: 12
    created_at: 2006-02-01 12:00:00
    is_public: true