Who’s job is it to load a plugin’s translated strings?

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EDIT – apparently this is all wrong so please disregard.

You can use the WP_LANG_DIR constant to load translations from the update-safe languages directory first, and fall back to your plugin languages directory for any plugin-supplied translations. The default location is wp-content/languages, and users can set WP_LANG_DIR themselves in wp-config.php. When you load translations from multiple sources, the first found instance will be used, so user translations will always override any plugin-supplied translations, and allow users to do partial translations without translating all strings.

function your_plugin_load_plugin_textdomain(){

    $domain = 'your-plugin';
    $locale = apply_filters( 'plugin_locale', get_locale(), $domain );

    // wp-content/languages/your-plugin/your-plugin-de_DE.mo
    load_textdomain( $domain, trailingslashit( WP_LANG_DIR ) . $domain . "https://wordpress.stackexchange.com/" . $domain . '-' . $locale . '.mo' );

    // wp-content/plugins/your-plugin/languages/your-plugin-de_DE.mo
    load_plugin_textdomain( $domain, FALSE, basename( dirname( __FILE__ ) ) . '/languages/' );

}
add_action( 'init', 'your_plugin_load_plugin_textdomain' );

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