Bump i18next from 25.7.1 to 25.8.0 in /frontend

Bumps [i18next](https://github.com/i18next/i18next) from 25.7.1 to 25.8.0.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/i18next@v25.7.1...v25.8.0)

---
updated-dependencies:
- dependency-name: i18next
  dependency-version: 25.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package.json

@@ -32,7 +32,7 @@
     "axios": "1.13.0",
     "date-fns": "4.1.0",
     "dayjs": "1.11.10",
-    "i18next": "25.7.1",
+    "i18next": "25.8.0",
     "nuqs": "2.8.0",
     "prettier-plugin-organize-imports": "^4.3.0",
     "react": "19.2.0",