CF7 calendar field language

Hi, i set in calendar field in HTML Tag attributies my language month and days : https://www.awesomescreenshot.com/image/8786190?key=a2dc0546528e51af722484e71bdc3f23
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but on web i see bad result : https://prnt.sc/13ix6nz
why ? can you help me fix it ?
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tahnks

Hi, any idea ?
Language strings dont work too.
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I add language strings for months : https://prnt.sc/13mdypm
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but in calendar it dont work : https://prnt.sc/13me92q
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This is bug because html attribute add one letter to one window : https://prnt.sc/13mecka
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can you help me fix it please ? tahnks

Hi, please can you help me with this problem ?
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Many thanks