add a modeladmin class for UserCategory and make it easer to view/find user-related objects
add a modeladmin class for UserCategory and make it easer to view/find user-related objects

izzyalonso/tndata_backend,tndatacommons/tndata_backend,izzyalonso/tndata_backend,tndatacommons/tndata_backend,tndatacommons/tndata_backend,tndatacommons/tndata_backend,izzyalonso/tndata_backend,izzyalonso/tndata_backend