I was recently wondering if you could rename that “Custom” tab when creating a new site that holds your custom site templates. Well, it turns out that you can. After searching a while on the net, i came across a post with the following information:
In SharePoint 2007, any custom templates added through the stsadm command
stdadm -o addtemplate appear under the “Custom” tab.
This may not appear sufficiently corporate for some people. One easy fix is to simply modify the locale file at
C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\Resources\core.en-US.resx. Just find
<value> to anything you like.