BookStack/resources/lang/en/activities.php

<?php

return [

    /**
     * Activity text strings.
     * Is used for all the text within activity logs.
     */

    // Pages
    'page_create' => 'created page',
    'page_update' => 'updated page',
    'page_delete' => 'deleted page',
    'page_restore' => 'restored page',

    // Chapters
    'chapter_create' => 'created chapter',
    'chapter_update' => 'updated chapter',
    'chapter_delete' => 'deleted chapter',

    // Books
    'book_create' => 'created book',
    'book_update' => 'updated book',
    'book_delete' => 'deleted book',
    'book_sort'   => 'sorted book',

];