remove unnecessary translation line

resource/locales/en_US/admin/admin.json

@@ -321,7 +321,6 @@
       "dont_need_update": "※If the value is already in there, there is no need to update it.",
       "select_install_your_app": "Select \"Install your app\".",
       "select_install_to_workspace": "Select \"Install to Workspace\".",
-      "register_official_bot_proxy_service": "Issue Access Token / Register GROWI Official Bot Proxy Service",
       "register_proxy_url": "Register Proxy URL with GROWI",
       "click_allow": "Select \"Allow\".",
       "install_complete_if_checked": "Confirm that \"Install your app\" is checked.",

resource/locales/ja_JP/admin/admin.json

@@ -318,7 +318,6 @@
       "dont_need_update": "※既に値が入っている場合は更新する必要はありません",
       "select_install_your_app": "Install your app をクリックします。",
       "select_install_to_workspace": "Install to Workspace をクリックします。",
-      "register_official_bot_proxy_service": "アクセストークンの発行 / GROWI Official Bot Proxy サービスへの登録",
       "register_proxy_url": "Proxy の URLをGROWIに登録する",
       "click_allow": "遷移先の画面にて、Allowをクリックします。",
       "install_complete_if_checked": "Install your app の右側に緑色のチェックがつけばワークスペースへのインストール完了です。",

resource/locales/zh_CN/admin/admin.json

@@ -328,7 +328,6 @@
       "dont_need_update": "※如果值已经在里面了，就不需要再更新。",
       "select_install_your_app": "选择 \"Install your app\"。",
       "select_install_to_workspace": "选择 \"Install to Workspace\"。",
-      "register_official_bot_proxy_service": "发行访问令牌 / 注册 GROWI 官方 Bot 代理服务",
       "register_proxy_url": "向 GROWI 注册代理 URL",
       "click_allow": "选择 \"Allow\"。",
       "install_complete_if_checked": "确认已选中 \"Install your app\"。",