rename xmpp button

json/cards.json

@@ -4,7 +4,7 @@
     {
     "name": "Jabber/XMPP",
       "description": "Jabber/XMPP is a set of open technologies for instant messaging, multi-party chat, and voice/video calls. XMPP stands for the Extensible Messaging and Presence Protocol.",
-      "button_text": "Register!",
+      "button_text": "Chat!",
       "link": "https://docs.nixnet.services/XMPP",
       "tor":"#"
     },