dev#188876 : Adding Placeholder for Library selection in auth/register

FEATURES/188876

+        '188876' =>
+            ['Label' => $this->_('Formulaire d'inscription, forcer le choix de la bibliothèque.
+  * Ajout de placeholder pour la sélection de bibliothèque'),
+             'Desc' => '',
+             'Image' => '',
+             'Video' => '',
+             'Category' => $this->_('Formulaire'),
+             'Right' => function($feature_description, $user) {return true;},
+             'Wiki' => '',
+             'Test' => '',
+             'Date' => '2024-02-28'],
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