corrected typo

src/set-session-language

@@ -35,7 +35,7 @@ class App(tk.Frame):
             )
         self.text.pack(side="top")
         cur_loc = locale.getlocale()
-        if cur_loc[0] is None or cur_loc[0] is None:
+        if cur_loc[0] is None or cur_loc[1] is None:
             self.chosen_locale.set('it_IT.utf8')
         else:
             self.chosen_locale.set(cur_loc[0]+'.'+cur_loc[1])