Google reCAPTCHA

From WHMCS Documentation

The following information is taken in part from here

Customizing the Look and Feel of reCAPTCHA

Theme

To make the reCAPTCHA widget display a different theme, you first need to add the following code in your main HTML page anywhere before the <form> element where reCAPTCHA appears. WHMCS would recommend placing this in the header.tpl file of your template just before the </head> tag.

{if $capatacha && $capatacha eq "recaptcha"}{literal}<script type="text/javascript">
 var RecaptchaOptions = {
    theme : 'theme_name'
 };
 </script>{/literal}{/if}

The 'theme_name' can be one of four pre-defined options

If you do not wish to use any of the default themes, you can create your own to match your site design. You can see how to do this @ Custom Theme. To use a custom theme, the theme variable must be set to 'custom'.

Language

By default, the language of the reCAPTCHA is English, however this can be customised to English (en), Dutch (nl), French (fr), German (de), Portuguese (pt), Russian (ru), Spanish (es) or Turkish (tr). To change the language, you need to set the lang var in the script configuration. To allow for multi-site configurations, you can use a language variable to define this.

{if $capatacha && $capatacha eq "recaptcha"}{literal}<script type="text/javascript">
 var RecaptchaOptions = {
    theme : 'theme_name',
    lang: '{/literal}{$LANG.recaptchalang}{literal}'
 };
 </script>{/literal}{/if}

Then in your language.php file you would have the following line to define your language for the reCAPTCHA:

$_LANG["recaptchalang"] = "nl";

If your language is not one supported by Google, you are able to create your own translations. More information on this at i18n