Update Batch Manager Unit Mode according to web design (see below).

![image](https://github.com/Piwigo/Piwigo/assets/164948925/539685b7-fee6-4451-8730-0beea95ebb5f)
Batch Manager Unit Mode redesign
This is a GitHub Issue
repo:Piwigo
owner:Piwigo
Title : Batch Manager Unit Mode redesign
Issue date:

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Update Batch Manager Unit Mode according to web design (see below).

![image](https://github.com/Piwigo/Piwigo/assets/164948925/539685b7-fee6-4451-8730-0beea95ebb5f)
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