This plugin is a Apache OFBiz plugin it's build as a POC, so sometine it's speaking about vue.js sometime frontjs sometine Portal sometine screen, lookup to the documentation to have the current status.
It's goal is to be a base to a futur Apache OFBiz plugin integrated to Apache OFBiz.
All documentation and detail about this plugin is on https://ofbizextra.org/ofbizextra_adocs/docs/asciidoc/developer-manual.html#_frontjs_portal