1. A computer-implemented method, comprising: while a software application is executing using a source language user interface, extracting source language GUI component text of a GUI component from bytecode of said software application; forming said extracted source language GUI component text into a localization pack file; translating said source language GUI component text of said localization pack file to a target language; in response to said software application executing again, loading said translated GUI component text from said localization pack file; and displaying said GUI component with said translated GUI component text.