diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/l10n/class-wp-translation-controller.php
--- a/wp/wp-includes/l10n/class-wp-translation-controller.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/l10n/class-wp-translation-controller.php	Fri Sep 05 18:52:52 2025 +0200
@@ -434,4 +434,22 @@
 
 		return $this->loaded_translations[ $locale ][ $textdomain ] ?? array();
 	}
+
+	/**
+	 * Returns a boolean to indicate whether a translation exists for a given string with optional text domain and locale.
+	 *
+	 * @since 6.7.0
+	 *
+	 * @param string  $singular   Singular translation to check.
+	 * @param string  $textdomain Optional. Text domain. Default 'default'.
+	 * @param ?string $locale     Optional. Locale. Default current locale.
+	 * @return bool  True if the translation exists, false otherwise.
+	 */
+	public function has_translation( string $singular, string $textdomain = 'default', ?string $locale = null ): bool {
+		if ( null === $locale ) {
+			$locale = $this->current_locale;
+		}
+
+		return false !== $this->locate_translation( $singular, $textdomain, $locale );
+	}
 }