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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can set your jotform to be in Slovenian, but it is up to the people that come to your jotform to type their responses in specific language.
So, while you can easily translate your jotform to Slovenian, they can simply write their responses in US, Russian or of any other country in between the two.
This would not be possible to prevent unless one would be checking the letters being typed to know if it is Latin, Cyrillic, Arabic, etc, followed by dictionary check to make sure that the word actually exists, etc.I suggest instead to simply remove the submission that is no in the specific language.To change the language, please take a look here: How to make your forms multilingual?