As mentioned earlier, the <default activity> tag defines one tag that applies to all activities, tasks, and workflows. Other resources can overwrite this setting.

<default-activity>
  <resource-bundle>
   atg.web.assetmanager.WebAppResources
  </resource-bundle>
</default-activity>

The main resource bundle is called atg.web.assetmanager.WebAppResources. Its properties file is located in <ATG10dir>/AssetUI/lib/classes.jar.