fix(authenticator): ARB syntax (#2560)

Remove unncessary commas

Author: dnys1

packages/amplify_authenticator/example/lib/l10n/amplify_en.arb

@@ -57,24 +57,22 @@
     "@signOut": {
         "description": "Label of button to sign out the user"
     },
-    "backTo": "Back to {previousStep, select, signUp{Sign Up}, signIn{Sign In}, confirmSignUp{Confirm Sign-up}, confirmSignInMfa{Confirm Sign-in} confirmSignInNewPassword{Confirm Sign-in} sendCode{Send Code} resetPassword{Reset Password} verifyUser{Verify User} confirmVerifyUser{Confirm Verify User}}",
+    "backTo": "Back to {previousStep, select, signUp{Sign Up} signIn{Sign In} confirmSignUp{Confirm Sign-up} confirmSignInMfa{Confirm Sign-in} confirmSignInNewPassword{Confirm Sign-in} sendCode{Send Code} resetPassword{Reset Password} verifyUser{Verify User} confirmVerifyUser{Confirm Verify User} other{ERROR}}",
     "@backTo": {
         "description": "Label of button to return to the previous step",
         "placeholders": {
             "previousStep": {
-                "type": "AuthenticatorStep",
                 "example": "signIn",
                 "description": "The title of the previous step."
             }
         }
     },
-    "signInWith": "Sign In with {provider, select, google{Google} facebook{Facebook} amazon{Amazon} apple{Apple}}",
+    "signInWith": "Sign In with {provider, select, google{Google} facebook{Facebook} amazon{Amazon} apple{Apple} other{ERROR}}",
     "@signInWith": {
         "description": "Label of button to sign in with a social provider",
         "placeholders": {
             "provider": {
-                "type": "AuthProvider",
-                "example": "Google",
+                "example": "google",
                 "description": "The social sign-in provider"
             }
         }

packages/amplify_authenticator/example/lib/l10n/amplify_es.arb

@@ -13,8 +13,8 @@
     "verify": "Verificar",
     "skip": "Omitir",
     "signOut": "Salir",
-    "backTo": "Regresar al {previousStep, select, signUp{registro}, signIn{inicio de sesión}, confirmSignUp{Confirmar registro}, confirmSignInMfa{Confirmar inicio de sesión} confirmSignInNewPassword{Confirmar inicio de sesión} sendCode{Enviar código} resetPassword{Restablecer contraseña} verifyUser{Verificar usuario} confirmVerifyUser{Confirmar verificación de usuario}}",
-    "signInWith": "Iniciar Sesión con {provider, select, google{Google} facebook{Facebook} amazon{Amazon} apple{Apple}}",
+    "backTo": "Regresar al {previousStep, select, signUp{registro} signIn{inicio de sesión} confirmSignUp{Confirmar registro} confirmSignInMfa{Confirmar inicio de sesión} confirmSignInNewPassword{Confirmar inicio de sesión} sendCode{Enviar código} resetPassword{Restablecer contraseña} verifyUser{Verificar usuario} confirmVerifyUser{Confirmar verificación de usuario} other{ERROR}}",
+    "signInWith": "Iniciar Sesión con {provider, select, google{Google} facebook{Facebook} amazon{Amazon} apple{Apple} other{ERROR}}",
     "us": "Estados Unidos",
     "selectDialCode": "seleccionar país",
     "confirmSignInCustomAuth": "Título de formulario personalizado"

packages/amplify_authenticator/example/lib/resolvers/localized_button_resolver.dart

@@ -68,12 +68,12 @@ class LocalizedButtonResolver extends ButtonResolver {
 
   @override
   String signInWith(BuildContext context, AuthProvider provider) {
-    return AppLocalizations.of(context).signInWith(provider);
+    return AppLocalizations.of(context).signInWith(provider.name);
   }
 
   @override
   String backTo(BuildContext context, AuthenticatorStep previousStep) {
-    return AppLocalizations.of(context).backTo(previousStep);
+    return AppLocalizations.of(context).backTo(previousStep.name);
   }
 
   @override