Use newer form of catching exceptions

autopep8 -i --select=W602
Also some other minor deprecated syntax changes, like "while 1".
I did not commit the less obvious changes.

weboob/applications/qcineoob/main_window.py

@@ -382,8 +382,7 @@ class MainWindow(QtMainWindow):
         if self.ui.backendEdit.count() == 0:
             self.backendsConfig()
 
-        langs = LANGUAGE_CONV.keys()
-        langs.sort()
+        langs = sorted(LANGUAGE_CONV.keys())
         for lang in langs:
             self.ui.langCombo.addItem(lang)
         self.ui.langCombo.hide()