Pure localization for JS with unlimited JSON. simple, no need to require dependencies such i18, etc...

translate.js

translate(key) {
  let res = key.split('.').reduce((a, b) => a[b], t.data)
  return res ? localStorage.getItem('translation') == 2 ? res[1] : res[0] : 'Translation not found'
}

//if you want to call tranlsate function from anywhere of your Vue application, you can use mixins
Vue.mixin({
  methods: {
    translate(key) {
      let res = key.split('.').reduce((a, b) => a[b], t.data)
      return res ? localStorage.getItem('translation') == 2 ? res[1] : res[0] : 'Translation not found'
    }
  }
})

//this function takes data from translations.json then displays in desired views
//json array translations can be extended as long as you need or queried from key-value storage (Mongo, Redis)

translations.json

{
  "data": {
    "item": {
      "name": ["Hello", "Konnichiwa"],
      "desc": ["Naruto:", "Uzumaki"]
    },
  }
}