Calendar bug

Dear Salonbooking Team, I ran into a problem with a calendar on my page while booking a service through Salon Booking. While choosing a time the buttons “next” and “back” are in the middle of the time selection buttons and I don´t know how to pull them down, so they don´t interfere while my customers are choosing the time of their appointment.
And also the translation of months here in the calendar is wrong and I could´t find how to fix it.
Could you please help me with that?
Thank you so much and have a nice day,
Veronika

The page I need help with: [log in to see the link]