Hello !
Automatic update via admin to 13.7.
As mentioned above, automatic sorting of albums according to prefixed filters results in a "Bad request" error. Manual sorting by drag and drop works.

In admin/albums.php, line 28, replace:

if (!empty($_POST) or isset($_GET['delete']))

by

if (isset($_GET['delete']))

Thanks a bunch for timely and prompt response. I have change the code as per your instructions. Now sort out issue have resolved :)

I get the correct labels in French or in English for Piwigo 13.7. What language do you use ? Maybe it's a language question.

apply automatic sort order
Root
Album name, A → Z
Album name, Z → A
Album name, 1 → 5 → 10 → 100
Album name, 100 → 10 → 5 → 1
Date created, new → old
Date created, old → new
Date posted, new → old
Date posted, old → new

appliquer un ordre de tri automatique
Racine
Nom de l'album, A → Z
Nom de l'album, Z → A
Nom d'album, 1 → 5 → 10 → 100
Nom d'album, 100 → 10 → 5 → 1
Date de création, récent → ancien
Date de création, ancien → récent
Date d'ajout, récent → ancien
Date d'ajout, ancien → récent

AFAIK it still runs with older versions, but PHP 8.0 is recommended as older versions are EOL.