The instructions above worked exactly as described and worked perfectly. Thank you; that was a very accurate, informative post.
In learning a bit about language localization using the above instructions, I found this to be true. If you want to have the change affect all portals under a DNN installation, and you have access to the file system, change the resource file directly as described above. Or, if you would rather change the language/localization resource for a single portal only (and/or maybe you do not have file system level access to the resource files), using DotNetNuke 4.3.3 at least, you can make a language modification using the web interface to your portal, too. Logged in as Admin or Host:
Admin > Languages > Language Editor > Local Resources > DesktopModules > Forum > App_LocalResources > SharedResources
Resource Name: AggregatedForumDescription.Text
Resource Name: AggregatedForumName.Text
(the above will get you to the change I was looking to make, but using Language Editor you can make all sorts of interface/language/localization modifications to suit your particular needs).