[USERINIT] LiveCD: Set UI language (#7069)

The LiveCD start dialog was not localized.
JIRA issue: N/A
- Just call SetThreadLocale after
  InitializeDefaultUserLocale call.

base/system/userinit/livecd.c

@@ -715,6 +715,9 @@ LocaleDlgProc(
                         /* Store the locale settings in the registry */
                         InitializeDefaultUserLocale(&NewLcid);
 
+                        /* Set UI language for this thread */
+                        SetThreadLocale(NewLcid);
+
                         SetKeyboardLayout(GetDlgItem(hwndDlg, IDC_LAYOUTLIST));
 
                         pState->NextPage = STARTPAGE;