Module not update data from lang inputs

[theDoris]

I try to make my own module.

I have 4 inputs and two of them is saved normally to database but those with language selector didn't save to database and I dont know why.

Can anyone check what is wrong with those inputs: MY_FRONTCONTENT and MY_CATEGORYCONTENT

public function getContent()
    {
        /**
         * If values have been submitted in the form, process.
         */
        if (((bool)Tools::isSubmit('submitMyModule')) == true) {
            $this->postProcess();
        }

        $this->context->smarty->assign('module_dir', $this->_path);
        $this->context->smarty->assign('form', $this->renderForm());
        $output = $this->context->smarty->fetch($this->local_path.'views/templates/admin/configure.tpl');
        return $output.$this->renderForm();
    }


    protected function renderForm()
    {
        $helper = new HelperForm();

        $helper->show_toolbar = false;
        $helper->table = $this->table;
        $lang = new Language((int)Configuration::get('PS_LANG_DEFAULT'));
        $helper->default_form_language = $this->context->language->id;
        $helper->module = $this;
        $helper->allow_employee_form_lang = Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') ? Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') : 0;
        //$helper->allow_employee_form_lang = Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG', 0);

        $helper->identifier = $this->identifier;
        $helper->submit_action = 'submitMyModule';
        $helper->currentIndex = $this->context->link->getAdminLink('AdminModules', false)
            .'&configure='.$this->name.'&tab_module='.$this->tab.'&module_name='.$this->name;
        $helper->token = Tools::getAdminTokenLite('AdminModules');

        $helper->tpl_vars = array(
            'fields_value' => $this->getConfigFormValues(), /* Add values for your inputs */
            'languages' => $this->context->controller->getLanguages(),
            'id_language' => $this->context->language->id,
        );

        return $helper->generateForm(array($this->getConfigForm()));
    }

    protected function getConfigForm()
    {
        return array(
            'form' => array(
                'legend' => array(
                'title' => $this->l('Settings'),
                'icon' => 'icon-cogs',
                ),
                'input' => array(
                    array(
                        'type' => 'switch',
                        'label' => $this->l('Enable?'),
                        'name' => 'MY_FRONT',
                        'is_bool' => true,
                        'desc' => $this->l('Enable on all pages'),
                        'values' => array(
                            array(
                                'id' => 'active_on',
                                'value' => true,
                                'label' => $this->l('Enabled')
                            ),
                            array(
                                'id' => 'active_off',
                                'value' => false,
                                'label' => $this->l('Disabled')
                            )
                        ),
                    ),
                    array(
                        'type' => 'textarea',
                        'autoload_rte' => true,
                        'name' => 'MY_FRONTCONTENT',
                        'label' => $this->l('Content'),
                        'desc' => $this->l('Put content'),
                        'lang' => true,
                    ),
                    array(
                        'type' => 'switch',
                        'label' => $this->l('Enable on category page?'),
                        'name' => 'MY_CATEGORY',
                        'is_bool' => true,
                        'desc' => $this->l('Enable on selected category'),
                        'values' => array(
                            array(
                                'id' => 'active_on',
                                'value' => true,
                                'label' => $this->l('Enabled')
                            ),
                            array(
                                'id' => 'active_off',
                                'value' => false,
                                'label' => $this->l('Disabled')
                            )
                        ),
                    ),
                    array(
                        'type' => 'textarea',
                        'autoload_rte' => true,
                        'name' => 'MY_CATEGORYCONTENT',
                        'label' => $this->l('Content'),
                        'desc' => $this->l('Put content visible in selected category'),
                        'lang' => true,
                    ),
                ),
                'submit' => array(
                    'title' => $this->l('Save'),
                ),
            ),
        );
    }

    /**
     * Set values for the inputs.
     */
    protected function getConfigFormValues()
    {
        $languages = Language::getLanguages(false);
        $values = array();

        foreach ($languages as $lang)
        {
            $values['MY_FRONTCONTENT'][$lang['id_lang']] = Configuration::get('MY_FRONTCONTENT_'.$lang['id_lang']);
            $values['MY_CATEGORYCONTENT'][$lang['id_lang']] = Configuration::get('MY_CATEGORYCONTENT_'.$lang['id_lang']);

        }
       
        $values['MY_FRONT'] = Configuration::get('MY_FRONT');
        $values['MY_CATEGORY'] = Configuration::get('MY_CATEGORY');
    
        return $values;
    }

    protected function postProcess()
    {
        $form_values = $this->getConfigFormValues();

        foreach (array_keys($form_values) as $key) {
            Configuration::updateValue($key, Tools::getValue($key));
        }

    }

Where I did mistake?