language in library

[BalaQT]

hi,
im using qt in debian. im creating a custom widget for using inside qtcreator. i want to give some language settings in my custom widget.
i tried the following ,
in plugin class, i added

myTablePlugin::myTablePlugin( QObject* parent )
: QObject(parent) {
    QTranslator *translator = new QTranslator(this);
    QVariant v=translator->load(":/myLang.qm");
    qApp->installTranslator(translator);
}

myTablePlugin::myTablePlugin( QObject* parent )
: QObject(parent) {
    QTranslator *translator = new QTranslator(this);
    QVariant v=translator->load(":/myLang.qm");
    qApp->installTranslator(translator);
}

To copy to clipboard, switch view to plain text mode 

after this, i created the .so file and copied to qt/bin/designer folder.
when i drag n drop my widget , In the user application , I can able to see the caption in local language.

but after running the application i cant able to see the language. i can see only the english captin.

pls guide me, how to set the language in plugin

pls guide me,
Bala