@matthias-kuhn I just tried ```self.tr(u'The file <b>"{0}"</b> has been deleted or is not accessible'.format(unicode(pathfile)))``` and I am getting:
```
Traceback (most recent call last):
  File "/usr/local/share/qgis/python/console/console_editor.py", line 692, in focusInEvent
    msgText = self.tr(u'The file "{0}" has been deleted or is not accessible'.format(unicode(pathfile)))
TypeError: function takes exactly 5 arguments (1 given)
```