opencart-module/admin/language/en-gb/extension/module/retailcrm.php

<?php

// Heading Goes here:
$_['heading_title']              = 'RetailCRM';
$_['retailcrm_title']            = 'RetailCRM';

// Text
$_['text_module']                = 'Modules';
$_['text_success']               = 'Setting saved';
$_['text_notice']                = 'Warning! Timezone in CRM & your shop must be equal, you must setup it here:';
$_['retailcrm_base_settings']    = 'Connection settings';
$_['retailcrm_dict_settings']    = 'Dictionary settings';
$_['retailcrm_countries_settings'] = 'Trading zones setting';

$_['retailcrm_url']              = 'RetailCRM URL';
$_['retailcrm_apikey']           = 'RetailCRM API Key';

$_['retailcrm_dict_delivery']    = 'Shipment methods';
$_['retailcrm_dict_status']      = 'Order statuses';
$_['retailcrm_dict_payment']     = 'Payment methods';

$_['column_total']               = 'Total';
$_['product_summ']               = 'Amount';

$_['article']                    = 'SKU';
$_['color']                      = 'Color';
$_['weight']                     = 'Weight';
$_['size']                       = 'Size';

// Errors
$_['error_permission']           = 'Warning! You do not have permission to modify module';