These functions just return a regular expression to define values TRUE and FALSE in the most spoken languages in the world. They are the default input for the function clean_logical.
regex_true()
regex_false()Wolfram Alpha, query: https://www.wolframalpha.com/input/?i=20+most+spoken+languages
Both functions support values "Yes" and "No" in the following languages: Arabic, Bengali, Chinese (Mandarin), Dutch, English, French, German, Hindi, Indonesian, Japanese, Malay, Portuguese, Russian, Spanish, Telugu, Turkish and Urdu.
Note: all these translations are in Latin characters only (e.g. "da" for Russian, "haan" for Hindi and "hai" for Japanese).