Load current locale using locale from the standard library.

src/set-session-language

 #!/usr/bin/env python3
 
+import locale
 import os.path
 import subprocess
 import tkinter as tk
@@ -28,24 +29,14 @@ class App(tk.Frame):
             if b'utf8' in l:
                 self.locales.append(l.decode())
 
-    def find_current_locale(self):
-
-        cmd = "cat ~/.dmrc|grep Language|tr '=' ' '|awk '{print $2}'"
-        ps = subprocess.Popen(cmd,shell=True,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
-        output = ps.communicate()[0]
-
-        self.curlocale = []
-        for l in output.split(b'\n'):
-            if b'utf8' in l:
-               self.curlocale.append(l.decode())
-
     def create_widgets(self):
         self.text = tk.Label(
             self,
             text=_("Scegli la lingua per le prossime sessioni.")
             )
         self.text.pack(side="top")
-        self.chosen_locale.set(self.curlocale[0])
+        cur_loc = locale.getlocale()
+        self.chosen_locale.set(cur_loc[0]+'.'+cur_loc[1])
         self.locale_menu = tk.OptionMenu(self, self.chosen_locale, *self.locales)
         self.locale_menu.pack(side="top")