125487 remove cancel button

apps/app/public/static/locales/en_US/admin.json

@@ -867,7 +867,6 @@
     "plugin_is_not_installed": "Plugin is not installed",
     "install": "Install",
     "delete": "Delete",
-    "cancel": "Cancel",
     "confirm": "Delete plugin?"
   },
   "cloud_setting_management": {

apps/app/public/static/locales/ja_JP/admin.json

@@ -875,7 +875,6 @@
     "plugin_is_not_installed": "プラグインがインストールされていません",
     "install": "インストール",
     "delete": "削除",
-    "cancel": "中止",
     "confirm": "プラグインを削除しますか？"
   },
   "cloud_setting_management": {

apps/app/public/static/locales/zh_CN/admin.json

@@ -875,7 +875,6 @@
     "plugin_is_not_installed": "Plugin is not installed",
     "install": "Install",
     "delete": "Delete",
-    "cancel": "Cancel",
     "confirm": "Delete plugin?"
   },
   "cloud_setting_management": {

apps/app/src/features/growi-plugin/client/components/Admin/PluginsExtensionPageContents/PluginDeleteModal.tsx

@@ -51,7 +51,6 @@ export const PluginDeleteModal = (props: PluginDeleteModalProps): JSX.Element =>
     }
     return (
       <>
-        <Button onClick={cancelToDelete}>{t('plugins.cancel')}</Button>
         <Button color="danger" onClick={confirmToDelete}>
           {t('plugins.delete')}
         </Button>