I installed the Flash Builder Burrito edition and added it as a dropin to my Eclipse.
dropin
Now all the Eclipse interface is in French. I sincerely love my countr
Add in your eclipse-instance eclipse/configuration/config.ini the following line:
osgi.nl=en
In addition to Tom answer, you can do it adding this option to your eclipse.ini as runtime option:
-ln en
Normally this file is more suitable to be customized.