translation

i need to translate plugin to another languages.
i used poedit. created .mo and .po files, named them correctly (woocommerce-product-sort-and-display-uk_ua.mo) and put at ‘languages’ folder. but it doesn’t work – site doesn’t see those translated files.
i tried to change my wp_config.php file. i added next line – define (‘wplang’, ‘uk_ua’);
but it still doesn’t work!

could you please create short manual about translation of your plugin? because it really needed and i’m not first with this problem..
thank you!