IGN:...

src/calibre/gui2/__init__.py

@@ -508,14 +508,21 @@ class ResizableDialog(QDialog):
 
 gui_thread = None
 
-
+qt_app = None
 class Application(QApplication):
 
     def __init__(self, args):
         qargs = [i.encode('utf-8') if isinstance(i, unicode) else i for i in args]
         QApplication.__init__(self, qargs)
-        global gui_thread
+        global gui_thread, qt_app
         gui_thread = QThread.currentThread()
+        self._translator = None
+        self.load_translations()
+        qt_app = self
+
+    def load_translations(self):
+        if self._translator is not None:
+            self.removeTranslator(self._translator)
         self._translator = QTranslator(self)
         if set_qt_translator(self._translator):
             self.installTranslator(self._translator)

src/calibre/gui2/wizard/__init__.py

@@ -492,7 +492,9 @@ class LibraryPage(QWizardPage, LibraryUI):
         import __builtin__
         __builtin__.__dict__['_'] = lambda(x): x
         from calibre.utils.localization import set_translators
+        from calibre.gui2 import qt_app
         set_translators()
+        qt_app.load_translations()
         self.emit(SIGNAL('retranslate()'))
         self.init_languages()
 
@@ -627,7 +629,7 @@ def wizard(parent=None):
     return w
 
 if __name__ == '__main__':
-    from PyQt4.Qt import QApplication
-    app = QApplication([])
+    from calibre.gui2 import Application
+    app = Application([])
     wizard().exec_()