Any system text of the MotoPress Hotel Booking plugin can be changed or translated with a translation plugin:
- Install the Loco Translate plugin from wp.org and activate it.
- Navigate to Dashboard > Loco Translate > Plugins and click Hotel Booking.
- Click New Language.
- Choose the language of your WordPress.
- Use the Filter field to find the string that you want to change.
- Insert your own phrase as a translation.
- Save and check the result.
You can also contribute to the official translation of the booking system here.