A method, a system, an apparatus, and a computer program product are presented for facilitating the customization, translation, or localization of messages, strings, or other program resources to be used by a locale-sensitive version of a Java.TM. program stored in a Java.TM. JAR file. After opening the JAR file, text strings within a resource bundle for a first locale can be determined through a particular process for inspecting the resource bundle. A resource bundle for a second locale containing translated versions of the text strings can be created through various means and then stored into the modified JAR file.