The documentation states that
"Any supported language code." is supported, but then says:
Which language is used in the interface for the pre-defined themes. The following languages are supported:
- English en
- Dutch nl
- French fr
- German de
- Portuguese pt
- Russian ru
- Spanish es
- Turkish tr
If the language of your site isn't supported, you can always use custom theming to put reCAPTCHA in your language.
- If the first statement is meant to mean:
- Any language. It isn't true because Japan (ja/jp/jpn) isn't supported as far as I can see. (Plus then, the last statement disproves the first one.)
- Languages in the list (above), then what about Italian? "it" is supported but not in the list.