Fix: 翻訳にdeepl以外を利用していると翻訳できない問題を修正

[penginn-net]

What

translatorAvailableが api/metaで正しく取得できない問題を修正

Why

deepl以外を利用しているときにtranslatorAvailableがフロント側に伝わらず、翻訳できなかったため
Resolve #240

Checklist

• コントリビューションガイドを読みました( Read the contribution guide)
• ローカル環境で動作しました(Test working in a local environment)
• (必要なら)CHANGELOG_YOJO.mdの更新((If needed) Update CHANGELOG_YOJO.md)
• (必要なら)テストの追加((If possible) Add tests)

[github-actions]

이 PR에 의한 api.json 차이

차이점은 여기에서 볼 수 있음

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 38.76%. Comparing base (dcd2af6) to head (cf3eb67).
Report is 5 commits behind head on develop.

Files	Patch %	Lines
...ges/backend/src/core/entities/MetaEntityService.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #355      +/-   ##
===========================================
- Coverage    38.76%   38.76%   -0.01%     
===========================================
  Files         1655     1655              
  Lines       215913   215932      +19     
  Branches      3679     3680       +1     
===========================================
+ Hits         83704    83709       +5     
+ Misses      131600   131575      -25     
- Partials       609      648      +39     

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