Fixed bug in shell user limits and added a missing error message.

interface/web/sites/lib/lang/en_shell_user.lng

@@ -19,4 +19,5 @@ $wb["quota_size_error_empty"] = 'Quota is empty.';
 $wb["uid_error_empty"] = 'UID empty.';
 $wb["uid_error_empty"] = 'GID empty.';
 $wb["directory_error_empty"] = 'Directory empty.';
+$wb["limit_shell_user_txt"] = 'The max number of shell users is reached.';
 ?>
\ No newline at end of file

interface/web/sites/shell_user_edit.php

@@ -58,7 +58,7 @@ class page_action extends tform_actions {
 			
 			// Get the limits of the client
 			$client_group_id = $_SESSION["s"]["user"]["default_group"];
-			$client = $app->db->queryOneRecord("SELECT limit_ftp_user FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = $client_group_id");
+			$client = $app->db->queryOneRecord("SELECT limit_shell_user FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = $client_group_id");
 			
 			// Check if the user may add another shell user.
 			if($client["limit_shell_user"] >= 0) {