change default logon page title for Windows PowerShell Web Access

I've installed Windows PowerShell Web Access on Server 2012 and it's working perfectly. However, I would like to change the default header on the logon page so that it reads 'My Company PowerShell Web Access' rather than 'Windows PowerShell Web Access'. I've dug around in the ASPX pages but I can't seem to find this value. 

Any one know where to change this setting?

Many thanks