You need to add the Resource string to the localization app. After step 9 of "Adding classes to modules" you will see the instructions for this. Right now it's probably listed as [object.....]
Create a resource string for displaying the class's object type name:
1) Open the Localization application.
2) On the Resource strings tab, click New string.
3) Enter the following Key: ObjectType.CompanyOverview_Office (the general format is ObjectType.<class code name with an underscore>)
4) Type the following text for the English version of the key: Custom office
5) You can optionally enter translations for other languages that you use for the administration interface.