Field name is missing in the contacts subpanel

Hi,
I have created a custom filed in the Contacts subpanel under Accounts (It is a custom ‘Call button’). In the admin panel studio, if we expands the accounts section and then the subpanel, the ‘call button’ item is visible. But it is missing in the front end. I have attached a screen shot. In the screen shot the call buttons are available in each row but the field name is missing as ‘Call Button’. Am i missing anything in the language file ? Please help me on this. Thanks.