I normaly use enumcustomize for adding/hidding some values to the different languages. Enumcustomizing saves these changes to the WTCustom folder and compiles the files.
If you already have all the changes in the WTCustom folder you have to save each file to have a new modification date and afterwards you can compile these changes without opening every file in enumcustomizing.
ant -f bin/tools.xml bundle_custom
and then
ant -f ./codebase/MakeJar.xml
This is also a good option to copy it between multiple servers.