The statement is very likely false. The source has likely made a mistake, it can happen to everyone. But please don't remove sourced statement, just deprecate them.
Topic on User talk:Marcus Cyron
You are wrong. The source only stated, that Gardner translated revised the english translation of Handford. The statement there, she speaks czech language is an obvious database mistake. Her main laguage is clearly english and this is not stated. Also in her CV is not the smallest hint, that she could speak czech. And this would be so special, she would say it there. In the biobliography is also not the smallest hint. Source for information are the english Wikipedia - there's also not a hin, that she speaks english. So what remains is a database error. We don't need to spread errors.
Hello, she of course did not speak Czech - the database is incorrect. We just don't remove incorrect sourced statements in Wikidata (unlike in Wikipedia).
You are wrong in one thing - The source did not state that Gardner translated something. The language field really is for languages spoken or written by the person. In 99% of cases, NK is correct. Here, NK made a mistake.
Do you understand now? Thanks