add more help about shortdesc length, and use the correct form option to set the length to 30 chars

lib/WebGUI/Asset/Sku/Product.pm

@@ -990,7 +990,7 @@ sub www_editVariant {
     );
     $f->text(
         -name      => 'shortdesc',
-        -size      => 30,
+        -maxlength => 30,
         -label     => $i18n->get('shortdesc'),
         -hoverHelp => $i18n->get('shortdesc description'),
         -value     => $data->{shortdesc},

lib/WebGUI/i18n/English/Asset_Product.pm

@@ -656,8 +656,8 @@ be useful, others may not.|,
 	},
 
     'shortdesc description' => {
-        message => q|The will be displayed to the user so they can purchase this variant of your product.|,
-        lastUpdated => 1209494298,
+        message => q|The will be displayed to the user so they can purchase this variant of your product.  It will be limited to 30 characters in length|,
+        lastUpdated => 1210191460,
     },
 
     'add variant' => {