Change PR comment text from Japanese to English

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

.github/workflows/report-backend-memory.yml

@@ -85,24 +85,24 @@ jobs:
       - id: build-comment
         name: Build memory comment
         run: |
-          HEADER="## バックエンドのメモリ使用量比較"
-          FOOTER="[詳細はWorkflowのログを確認してください](https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID})"
+          HEADER="## Backend Memory Usage Comparison"
+          FOOTER="[See workflow logs for details](https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID})"
 
           echo "$HEADER" > ./output.md
           echo >> ./output.md
 
           if [ "${{ steps.compare.outputs.has_data }}" == "true" ]; then
-            echo "| 項目 | base | head | 差分 |" >> ./output.md
-            echo "|------|------|------|------|" >> ./output.md
+            echo "| Metric | base | head | Diff |" >> ./output.md
+            echo "|--------|------|------|------|" >> ./output.md
             echo "| RSS | ${{ steps.compare.outputs.base_mb }} MB | ${{ steps.compare.outputs.head_mb }} MB | ${{ steps.compare.outputs.diff_mb }} MB (${{ steps.compare.outputs.diff_percent }}%) |" >> ./output.md
             echo >> ./output.md
 
             if [ "${{ steps.compare.outputs.significant_increase }}" == "true" ]; then
-              echo "⚠️ **注意**: メモリ使用量が5%以上増加しています。意図しない変更でないか確認してください。" >> ./output.md
+              echo "⚠️ **Warning**: Memory usage has increased by more than 5%. Please verify this is not an unintended change." >> ./output.md
               echo >> ./output.md
             fi
           else
-            echo "メモリ使用量を取得できませんでした。" >> ./output.md
+            echo "Could not retrieve memory usage data." >> ./output.md
             echo >> ./output.md
           fi
 
@@ -119,4 +119,4 @@ jobs:
           pr_number: ${{ steps.load-pr-num.outputs.pr-number }}
           comment_tag: show_memory_diff_error
           message: |
-            バックエンドのメモリ使用量比較中にエラーが発生しました。詳細は[Workflowのログ](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})を確認してください。
+            An error occurred while comparing backend memory usage. See [workflow logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for details.