This is still an issue in 5.0.1.200908032119 however you can fix it by adding the following setting to -vmargs in your eclipse.ini file:
-Duser.language=en.
Transform SWF is a Java framework for processing Flash files. Classes are provided for reading and writing the data structures in the Flash file format along with utility classes for adding images, sound, text and shapes. Version 2.3.2 is a maintenance release containing fixes when loading files with character encodings other than UTF-8.
