I found a solution to my problem:
When I ported from Linux, I saved the qt translation files (qt_xx.qm). However, the application menu lines are not translated in this file. I just replaced this file with qt_xx.qm Qt Sdk for Mac and ... it works.
Some recommendations: Snow Leopard with Qt 4.7.0 only requires a folder named xx.lproj to translate the application menu and qt dialogs.
Sorry to bother you.
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