Show All Boards Archive and Clone Boards buttons only on desktop webbrowser mode for BoardAdmin/Admin/Sandstorm users.
Show All Boards Archive and Clone Boards buttons only on
desktop webbrowser mode for BoardAdmin/Admin/Sandstorm users.

Thanks to derbolle and xet7 !

Closes #2599

wekan/wekan,wekan/wekan,GhassenRjab/wekan,wekan/wekan,GhassenRjab/wekan,wekan/wekan,GhassenRjab/wekan,wekan/wekan