allow underscore in ALIAS name (Fixes: #3866)

Florian Schaal

2016-04-30 8beb039f0b7d23b03f7963c3a56c8dde65af3b6b

 interface/lib/classes/validate_client.inc.php

@@ -161,6 +161,8 @@

         // Test if the country of the VAT-ID matches the country of the customer
         if($country != ''){
            // Greece
            if($country == 'GR') $country = 'EL';
            if(strtoupper($cc) != $country){
               $errmsg = $validator['errmsg'];
               if(isset($app->tform->wordbook[$errmsg])) {