GetLink redesign

Also, try with entered username first (issue #524)

src/assets/translations/en.json

@@ -189,9 +189,9 @@
   },
   "getlink": {
     "title": "Get a Direct Link",
-    "password": "Set your password",
-    "password_repeat": "Confirm your password",
-    "create": "Create",
+    "info": "Direct links give people a secure line of communication with you. To start, choose a screen name to show when people enter a chat with you.",
+    "username": "Enter a screen name (ex: waku)",
+    "next": "Next",
     "hello": "Hello {user},\nHere’s your Direct Link",
     "ready_to_share": "It’s ready to share! A new direct room will open each time someone opens the link.",
     "scan_title": "Scan this code to start a direct chat",