pyqgis - Edit UI - Python Init function localization with QTranslator?

I have interaction with layer defined by custom designed UIs. In layer properties the following settings: Edit UI - customline.ui and Python Init function: customline_set.py.

#coding: utf8
from PyQt4.QtCore import *
from PyQt4.QtGui import *

nameField = None
myDialog = None

def formOpen(dialog,layerid,featureid):
    global myDialog

    myDialog = dialog
    global nameField

    translator = QTranslator()
    loc = QSettings().value('locale/userLocale')[0:2]
    print loc
    filename = "\\i18n\\customline_%s.qm" % loc
    print filename
    translator.load(filename)
    QCoreApplication.installTranslator(translator)


    print QCoreApplication.translate('editForm',"Generals")
    # return translated string ok

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The code work without error but the UI it's not displayed in selected language.

Can anyone point me in the direction of the mistake here?