PLT-2457: Fix User Sign-up Flow - error messages (#2708)

webapp/components/signup_user_complete.jsx

@@ -148,8 +148,10 @@ class SignupUserComplete extends React.Component {
                 nameError: (
                     <FormattedMessage
                         id='signup_user_completed.usernameLength'
-                        min={Constants.MIN_USERNAME_LENGTH}
-                        max={Constants.MAX_USERNAME_LENGTH}
+                        values={{
+                            min: Constants.MIN_USERNAME_LENGTH,
+                            max: Constants.MAX_USERNAME_LENGTH
+                        }}
                     />
                 ),
                 emailError: '',
@@ -167,7 +169,9 @@ class SignupUserComplete extends React.Component {
                 passwordError: (
                     <FormattedMessage
                         id='signup_user_completed.passwordLength'
-                        min={Constants.MIN_PASSWORD_LENGTH}
+                        values={{
+                            min: Constants.MIN_PASSWORD_LENGTH
+                        }}
                     />
                 ),
                 serverError: ''