use setlocale() for escapeshellarg()

[AutopilotNN]

As a result of work of a script in exec plug-in I have received "pi" in utf-8 encoding. After application of escapeshellarg() the way to base has been broken.
I had to set a locale in config.php:
setlocale(LC_CTYPE, "ru_RU.UTF-8");

[AutopilotNN]

And functions.inc.php, line 37 :

			if (!preg_match('/^[\p{L}-.: ]+$/u', $value)) {