Update to use i18n label for internationalization related issue

Author: yuhattor

.github/workflows/i18n-consistency-checker.yaml

@@ -97,7 +97,7 @@ jobs:
  if expr "$existing_issue_id" : '^[0-9]*$' >/dev/null; then
  gh issue comment "$existing_issue_id" -F issue.md -R $GITHUB_REPOSITORY
  else
- gh issue create -t "$issue_title" -F issue.md -R $GITHUB_REPOSITORY -l documentation
+ gh issue create -t "$issue_title" -F issue.md -R $GITHUB_REPOSITORY -l i18n
  fi
  fi
  env: