Ok nice ...
We found the Translations path for Default dialog..
We found qt_fr.qm for franchese translation....

We are using these code

qtTranslator.load("qt_" + QLocale::system().name(),
QLibraryInfo::location(QLibraryInfo::TranslationsP ath));
It is loading qt_fr.qm file.

We r using Qt 4.3.4 for Mac OS.
But whenever we make Exe of our application I think we have to include This Qt's Translation folder in our App's -> Contents->Resources->Translation->qt_fr.qm.

Or any other solution to include this translation path in our Application's Exe.