How to change the text “Please prove you are …” to Serbia

Hi there,
I need to find out how to change the Text:
“Please prove you are human by selecting the..” into Serbian?
I followed the page on your plugin troubleshoot pages:
https://translate.projectdmc.org/projects/wp-plugins/contact-form-7-image-captcha/
And I see Serbian is 0% integrated but there should be a way to change that text in a database or somehow else?

 

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