Replace generic alert, form and table templates with new Bootstrap equivalents

controllers/ManageUsers.php

@@ -18,7 +18,7 @@ class ManageUsers extends HTMLController
 			'form' => [
 				'action' => BASEURL . '/edituser/',
 				'method' => 'get',
-				'class' => 'floatright',
+				'class' => 'float-end',
 				'buttons' => [
 					'add' => [
 						'type' => 'submit',
@@ -94,7 +94,7 @@ class ManageUsers extends HTMLController
 			'title' => 'Manage users',
 			'no_items_label' => 'No users meet the requirements of the current filter.',
 			'items_per_page' => 30,
-			'index_class' => 'floatleft',
+			'index_class' => 'float-start',
 			'base_url' => BASEURL . '/manageusers/',
 			'get_data' => function($offset = 0, $limit = 30, $order = '', $direction = 'down') {
 				if (!in_array($order, ['id_user', 'surname', 'first_name', 'slug', 'emailaddress', 'last_action_time', 'ip_address', 'is_admin']))