Introduce reviewdog/action-languagetool@v1

https://github.com/reviewdog/action-languagetool

Author: haya14busa

.github/workflows/reviewdog.yml

@@ -23,3 +23,9 @@ jobs:
           github_token: ${{ secrets.github_token }}
           reporter: github-check
           level: warning
+
+      - uses: reviewdog/action-languagetool@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+          level: info