error message for disabled SSO registration

public/language/en-GB/error.json

@@ -152,6 +152,7 @@
 	"parse-error": "Something went wrong while parsing server response",
 	"wrong-login-type-email": "Please use your email to login",
 	"wrong-login-type-username": "Please use your username to login",
+	"sso-registration-disabled": "Registration has been disabled for %1 accounts, please register with an email address first",
 
 	"invite-maximum-met": "You have invited the maximum amount of people (%1 out of %2).",
 

public/language/en-US/error.json

@@ -125,6 +125,7 @@
     "parse-error": "Something went wrong while parsing server response",
     "wrong-login-type-email": "Please use your email to login",
     "wrong-login-type-username": "Please use your username to login",
+    "sso-registration-disabled": "Registration has been disabled for %1 accounts, please register with an email address first",
     "invite-maximum-met": "You have invited the maximum amount of people (%1 out of %2).",
     "no-session-found": "No login session found!",
     "not-in-room": "User not in room",