I find it difficult to understand where you added the useTag() function.
If it is in the FormHelper.php class, you probably need to use
echo $this->Form->useTag(...)
If you have it in your own Helper class LanguageHelper (a much better solution so not to change the CakePHP's core), you will need to ensure your LanguageHelper is "used" in the Controller.
e.g.
public $helpers = array( 'Language' );
If you just have one function, perhaps it's easier to add it to View/Helper/AppHelper.php and have it available in all the helpers.
-- If it is in the FormHelper.php class, you probably need to use
echo $this->Form->useTag(...)
If you have it in your own Helper class LanguageHelper (a much better solution so not to change the CakePHP's core), you will need to ensure your LanguageHelper is "used" in the Controller.
e.g.
public $helpers = array( 'Language' );
If you just have one function, perhaps it's easier to add it to View/Helper/AppHelper.php and have it available in all the helpers.
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