[wp-trac] [WordPress Trac] #37616: Replace `is_super_admin()` calls with real capability checks

[WordPress Trac]

#37616: Replace `is_super_admin()` calls with real capability checks
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 Reporter:  flixos90         |       Owner:
     Type:  task (blessed)   |      Status:  reviewing
 Priority:  normal           |   Milestone:  4.8
Component:  Role/Capability  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:  multisite
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Comment (by flixos90):

 To-Do:

 * Replace check in `wp-includes/ms-load.php` (line 84) with
 `current_user_can( 'manage_site', $blog->id )` and move it below the
 get_site() call. This relies on #39156 to be completed prior.
 * Replace the checks in `wp-admin/options-general.php` (line 147) and `wp-
 admin/options.php` (line 185) with capabilities for managing translations.
 This relies on #39677 to be completed prior.
 * Replace the following checks with `user_can( $user_id, 'manage_network'
 )` (these are general checks whether a user is a super admin and therefore
 we should use the most basic capability to determine that, which is
 `manage_network`):
     * `wp-admin/includes/class-wp-ms-users-list-table.php` (line 208)
     * `wp-admin/upgrade.php` (lines 265 and 281)
     * `wp-admin/network/site-new.php` (line 132)
     * `wp-admin/network/users.php` (line 69)
     * `wp-admin/user-edit.php` (line 157)
     * `wp-includes/ms-functions.php` (line 1188)
     * `wp-login.php` (line 835)

 No tickets have been opened yet for any of the above three items.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37616#comment:65>
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