Bump vue-i18n from 8.18.2 to 8.19.0 in /frontend

Bumps [vue-i18n](https://github.com/kazupon/vue-i18n) from 8.18.2 to 8.19.0.
- [Release notes](https://github.com/kazupon/vue-i18n/releases)
- [Changelog](https://github.com/kazupon/vue-i18n/blob/v8.x/CHANGELOG.md)
- [Commits](https://github.com/kazupon/vue-i18n/compare/v8.18.2...v8.19.0)

Signed-off-by: dependabot[bot] <support@github.com>

frontend/package-lock.json

@@ -9271,9 +9271,9 @@
             "dev": true
         },
         "vue-i18n": {
-            "version": "8.18.2",
+            "version": "8.19.0",
-            "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-8.18.2.tgz",
+            "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-8.19.0.tgz",
-            "integrity": "sha512-0X5nBTCZAVjlwcrPaYJwNs3iipBBTv0AUHwQUOa8yP3XbQGWKbRHqBb3OhCYtum/IHDD21d/df5Xd2VgyxbxfA==",
+            "integrity": "sha512-jXPsvkmDMkwhjGQEDF6BgGsmJQLjIO1CXJQ1RjZRnU80kzRG+/+277ADFTulAPQSb0hUlrsp4VzEPdeO7lKcRA==",
             "dev": true
         },
         "vue-loader": {

frontend/package.json

@@ -19,7 +19,7 @@
         "sass": "^1.26.10",
         "sass-loader": "^8.0.0",
         "vue": "^2.6",
-        "vue-i18n": "^8.15",
+        "vue-i18n": "^8.19",
         "vue-template-compiler": "^2.6.11"
     },
     "dependencies": {