Added languages getter

src/PKPass.ts

@@ -179,6 +179,14 @@ export default class PKPass extends Bundle {
 		this[certificatesSymbol] = certs;
 	}
 
+	/**
+	 * Allows retrieving current languages
+	 */
+
+	public get languages() {
+		return Object.keys(this[localizationSymbol]);
+	}
+
 	/**
 	 * Allows getting an image of the props
 	 * that are composing your pass instance.