It's a simple java tool to port translations based on new / old XML's. Works only on strings.xml for now.
Usage is something like
java -jar XMLDiff.jar old.xml new.xml
There's also an extra argument to exclude certain values that already exists on current branch languages (Mostly like is the one that should be used)
java -jar XMLDiff.jar old.xml new.xml excluded.xml
For example:
java -jar XMLDiff.jar values-ES-ics.xml values-EN.xml values-ES-jellybean.xml