With GoReminders you can send fully customizable SMS and email reminders! If you need to send reminders in another language, you can create a new template for that.
When you create a new appointment on the New Appointment page you will see the option to select the Message(s) drop-down menu. These messages are called Message Templates. Message Templates are the messages that are used for your reminder messages.
You can set up multiple Message Templates to choose from!
This video explains how to create a new Message Template: