Calendar date cft in another language

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Hi,
i have my website in two languages, italian as first language and english as second one, i would like have the date of calendar of cf7 also in english.
Please can you help me to set up it?

This the code of cf7:

<p>Please select your check-in date:[text* check-in id:checkin]</p>
<div style="position:relative">[calendar name= "checkin" type="pop-up"]</div>
<p>Select your date of departure:[text* check-out id:checkout]</p>
<div style="position:relative">[calendar name= "checkout" type="pop-up"]</div>

Thank you in advance,
Mattia