feat: add Spanish (es_ES) and Romanian (ro_RO) translations

- Generate woolist-phplist.pot from all 48 translatable strings
- Add full es_ES.po / ro_RO.po with translations for all strings
- Compile binary .mo files for both locales
- Add load_plugin_textdomain() call so WordPress loads the translations

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

woolist-phplist/woolist-phplist.php

@@ -40,6 +40,8 @@ function woolist_check_woocommerce() {
  * Bootstrap the plugin after all plugins are loaded.
  */
 function woolist_init() {
+	load_plugin_textdomain( 'woolist-phplist', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
+
 	if ( ! woolist_check_woocommerce() ) {
 		return;
 	}