Optimize discardChangesDialog attention message when using chinese as language.

PPOCRLabel/PPOCRLabel.py

@@ -1790,6 +1790,9 @@ class MainWindow(QMainWindow, WindowMixin):
 
     def discardChangesDialog(self):
         yes, no, cancel = QMessageBox.Yes, QMessageBox.No, QMessageBox.Cancel
+        if self.lang == 'ch':
+            msg = u'您有未保存的变更, 您想保存再继续吗?\n点击 "No" 丢弃所有未保存的变更.'
+        else:
             msg = u'You have unsaved changes, would you like to save them and proceed?\nClick "No" to undo all changes.'
         return QMessageBox.warning(self, u'Attention', msg, yes | no | cancel)