As of v0.9.4.2, the invitee-facing booking widget is fully translatable. If you and your invitees are non-English speakers, you can now localise all text strings in all invitee-facing components like the booking widget, email content and calendar events.
And what’s more? If you contribute to the translation efforts of the plugin, you receive a 1-year Pro license (for 1 site) for Free.
To be eligible to receive the complimentary license, you should translate all strings to your language, submit it and get it approved and published.