chore: update app welcome byline

Author: hazzuk

src/i18n/strings/en_EN.json

@@ -1684,7 +1684,7 @@
         "create_room": "Create a Group Chat",
         "explore_rooms": "Explore Public Rooms",
         "has_avatar_label": "Great, that'll help people know it's you",
-        "intro_byline": "Own your conversations.",
+        "intro_byline": "Plug and play privacy.",
         "intro_welcome": "Welcome to %(appName)s",
         "no_avatar_label": "Add a photo so people know it's you.",
         "send_dm": "Send a Direct Message",