The problem is that BPS code does not have an i18n function to convert the English text to any other language. That new i18n translation code will need to be added in the next BPS version.
The datbase options are:
bps_tooltip_captcha_key
bps_tooltip_captcha_hover_text
To set your CAPTCHA use the JTC CAPTCHA option.
To set your CAPTCHA ToolTip use the JTC ToolTip option.
Select the Form checkboxes for which forms you want a CAPTCHA displayed on.
Click the Save Options button.