Add vue-i18n library

Author: makeupsomething

package.json

@@ -64,6 +64,7 @@
     "lint-staged": "^8.1.7",
     "prettier": "^1.17.1",
     "vee-validate": "^2.2.9",
+    "vue-i18n": "^8.12.0",
     "vue-jest": "^3.0.4",
     "vue-router": "^3.0.6",
     "vuex": "^3.1.1"