hCaptcha default language change (#9)

README.md

@@ -42,8 +42,10 @@ X3dgoo\HCaptcha\Forms\HCaptchaField:
 
 We generate our site key and secret key at https://www.hcaptcha.com/
 
-The language of the captcha can be changed by setting the language_code variable to any of the
-[available hCaptacha languages](https://docs.hcaptcha.com/languages/):
+The default language of the captcha will be set to the site language. This can be changed by setting 
+the language_code variable to any of the
+[available hCaptacha languages](https://docs.hcaptcha.com/languages/). If not set this will default 
+to the current site locale:
 
 ```yml
 X3dgoo\HCaptcha\Forms\HCaptchaField:

src/Forms/HCaptchaField.php

@@ -7,6 +7,7 @@
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\FormField;
 use SilverStripe\Forms\Validator;
+use SilverStripe\i18n\i18n;
 use SilverStripe\ORM\FieldType\DBHTMLText;
 use SilverStripe\View\Requirements;
 
@@ -59,9 +60,8 @@ class HCaptchaField extends FormField
     /**
      * Captcha language code
      * @var string
-     * @default en
      */
-    private static $language_code = 'en';
+    private static $language_code;
 
     /**
      * Creates a new HCaptcha field.
@@ -95,8 +95,10 @@ public function Field($properties = [])
             );
         }
 
+        $languageCode = self::config()->language_code ?? i18n::getData()->langFromLocale(i18n::get_locale());
+
         Requirements::javascript(
-            'https://hcaptcha.com/1/api.js?hl=' . self::config()->language_code
+            'https://hcaptcha.com/1/api.js?hl=' . $languageCode
         );
 
         return parent::Field($properties);