The system dump of Galaxy S4 was leaked so I tried to find out the .jar and .so dependencies of each apk in order to make some apps working on Galaxy S3 Note2 and Galaxy S3.
1-I found out that some apps were specilly developed for 4.2.2 but that shouldn't something difficult to fix
2-As usual, most apps not only depend on .so files but also on .jar files from /sytem/framework (specially ext.jar, core.jar, framework.jar and framework2.jar. As I don't have a clue about modding .jar files I couldn't go further on my experiment
S Translator with voice recognition working
At least I managed to have a better S Translator with voice recognition working thanks to the necessary .so file.
However it still force closes if you tap on "history" or "preset phrases", it could be fixed if someone knows how to port 4 specific .jar files.
Edit:Updated so now you can flash it via CWM instead of copy&paste with root explorer.