1.2.2リリース用フロントページの更新

[h8892-inaba]

link to #267

Drupal更新に伴い、下記ファイルを更新した

• https://openrtm.org/openrtm/ja/node/155/

  • -> /download/download_frontpage_ja.txt

• https://openrtm.org/openrtm/en/node/364/

  • -> /download/download_frontpage_en.txt

• [x] Did you check grammar? (ex. https://www.grammarly.com/, https://www.kiji-check.com/)

• [x] Did you check pukiwiki grammar?

• [x] Did you check Japanese-English consistency?