refactor(frontend): 非推奨の表現を改める

[kakkokari-gtyih]

What

• i18n.t('') を i18n.tsx に置き換え
• shikiのgetHighlighterCoreをcreateHighlighterCoreに置き換え（ https://github.com/shikijs/shiki/pull/702 ）

Why

Additional info (optional)

Checklist

• [x] Read the contribution guide
• [ ] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 3.03030% with 32 lines in your changes missing coverage. Please review.

Project coverage is 19.57%. Comparing base (f393b6b) to head (b2f5168). Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rontend/src/pages/settings/preferences-backups.vue	0.00%	30 Missing :warning:
packages/frontend/src/scripts/code-highlighter.ts	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14517 +/- ## ======================================== Coverage 19.57% 19.57% ======================================== Files 717 717 Lines 100466 100465 -1 Branches 1005 1005 ======================================== Hits 19669 19669 + Misses 80251 80250 -1 Partials 546 546 ```

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[kakkokari-gtyih]

👀

[kakkokari-gtyih]

このPRで変えた部分だけi18n.t()を使い続けていた理由とかってあるのかしら

[acid-chicken]

このPRで変えた部分だけi18n.t()を使い続けていた理由とかってあるのかしら

7881f06be060dd955499a6beff3ad1967ed628f6 576484835ebe0c896b7fd242c7f8d58b32579da6

[kakkokari-gtyih]

このPRで変えた部分だけi18n.t()を使い続けていた理由とかってあるのかしら

7881f06 5764848

どちらも特に問題なさそうではある（MkPostFormAttaches.vueは時期的に過渡期だった可能性がある。preferences-backups.vueはi18nの書き方が特殊だったから置き換え漏れたとか？）

[acid-chicken]

コミット日付

[syuilo]

🙏🏿