core-bundle/src/Resources/contao/forms/Form.php
public function generate()
	{
		if (TL_MODE == 'BE')
		{
			$objTemplate = new BackendTemplate('be_wildcard');
			$objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['CTE']['form'][0]) . ' ###';
			$objTemplate->id = $this->id;
			$objTemplate->link = $this->title;
			$objTemplate->href = 'contao/main.php?do=form&amp;table=tl_form_field&amp;id=' . $this->id;

			return $objTemplate->parse();
		}

		if ($this->customTpl != '' && TL_MODE == 'FE')
		{
			$this->strTemplate = $this->customTpl;
		}

		return parent::generate();
	}
public function generate()
	{
		if (TL_MODE == 'BE')
		{
			$objTemplate = new BackendTemplate('be_wildcard');
			$objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['CTE']['form'][0]) . ' ###';
			$objTemplate->id = $this->id;
			$objTemplate->link = $this->title;
			$objTemplate->href = 'contao/main.php?do=form&amp;table=tl_form_field&amp;id=' . $this->id;

			return $objTemplate->parse();
		}

		if ($this->customTpl != '' && TL_MODE == 'FE')
		{
			$this->strTemplate = $this->customTpl;
		}

		return parent::generate();
	}
Remove name attributes in the back end so the form is not validated

@return string