Removing/ Changing Title of Work follow popup form (sharepoint 2013)

 By default work follow form title is the task list title if you want to Change it
replace the following  code with existing "PlaceHolderPageTitle" asp:conetent  in wrktaskIP.aspx
(this file is located in your server)
and if you want to add your custom title add the your tile in text property.

like 

          asp:Content ContentPlaceHolderId="PlaceHolderPageTitle" runat="server"
         SharePoint:EncodedLiteral runat="server" text="" EncodeMethod='HtmlEncode'
asp:Content


now your form header look like this  with out Title.