Unfortunately I cannot build the project, getting a type error with the vue-cli-plugin-i18n package.
You also have a lot going on 
It might be good to reference the starter projects here. It’s very possible there is an issue or conflict with the ion-router-outlet as you have four of them. You can have multiple but not sure on the proper way to set them up. Unfortunately that is out of my wheelhouse as I don’t fully understand the Ionic magic with the router…lol.
UPDATE
Here is another resource that might be helpful.