How to avoid language files overwriting in multisite

Hi @flipgatt, whatever files you replace, update or modify in any way inside /wp-content/plugins/mailpoet/ will always get overwritten on plugin update.

To prevent that, you’ll have to add the custom translations to some other folder and write a script (or MU plugin in wp-content/mu-plugins/) to load them, something like this (I haven’t try that, but should work in theory):

<?php
/**
 * Plugin Name: MailPoet custom Italian translation
 */

add_filter(
  'load_textdomain_mofile',
  static function ($mofile, $domain) {
    if ($domain !== 'mailpoet' || basename($mofile) !== 'mailpoet-it_IT.mo') {
      return $mofile;
    }

    $custom = WP_CONTENT_DIR . '/languages/custom/mailpoet-it_IT.mo';

    return file_exists($custom) ? $custom : $mofile;
  },
  10,
  2
);

You can read more about loading custom translations in https://developer.wordpress.org/plugins/internationalization/how-to-internationalize-your-plugin/#plugins-on-wordpress-org and here is documentation for that function https://developer.wordpress.org/reference/hooks/load_textdomain_mofile/.

• This reply was modified 1 day, 22 hours ago by Ján Mikláš.