Hi,
First, I recommend if you work with the source code to use svn trunk so you can get the latest code and stay up to date. 2.3.3.2 is old code in the mojo universe.
DeleteLinkImage is a local variable declared in the code behind file for the sitesettings.aspx page, it does not come from a resource file in the business layer. In the latest code it is declared like this:
protected string DeleteLinkImage = "~/Data/SiteImages/" + WebConfigSettings.DeleteLinkImage;
If you are working with the source code and have troubles with a custom build you should post questions in the developer forum rather than the site administration forum.
Hope it helps,
Joe