Include external po file for 3th party plugin to theme

If discussed plugin already uses load_plugin_textdomain() function to load its translations, usually it is enough to place <plugin_name>-<locale_code>.mo file to the wp-content/languages/plugins directory. If it doesn’t (or you can’t do it for some reason), you can use init hook to load its translation via your functions.php. Here is an example from one of my child themes:

function load_plugin_translations() {
    if ( is_plugin_active( 'woocommerce-payment-status/woocommerce-payment-status.php' ) ) {
        load_textdomain( 'woocommerce_payment_status', get_stylesheet_directory() . '/languages/woocommerce_payment_status-' . get_user_locale() . '.mo' );
    }
}
add_action( 'init', 'load_plugin_translations' );

Here I use woocommerce_payment_status-<locale>.mo translation file from the languages folder under my child theme. Replace woocommerce-payment-status/woocommerce-payment-status.php plugin ID and woocommerce_payment_status textdomain ID according to your plugin.

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