Revert "Remove bootstrap classes"

This reverts commit 682472ca6b744c80dce1b422520c4c072cb850d2.

application/views/scripts/config/authentication/modify.phtml

@@ -8,7 +8,7 @@
 <?php endif ?>
 
 <?php if ($this->form->getErrorMessages()): ?>
-<div>
+<div class="alert alert-danger">
   <?php foreach ($this->form->getErrorMessages() as $error): ?>
     <?= $this->escape($error); ?><br/>
   <?php endforeach; ?>

application/views/scripts/config/logging.phtml

@@ -10,14 +10,14 @@
 <?php endif ?>
 
 <?php if ($this->successMessage): ?>
-<div>
+<div class="alert alert-success">
   <i class="icinga-icon-success"></i>
   <strong><?= $this->escape($this->successMessage); ?></strong>
 </div>
 <?php endif; ?>
 
 <?php if (!empty($errors)) : ?>
-<div>
+<div class="alert alert-danger">
   <h4>Errors occured when trying to save the project.</h4>
   <p>
       The following errors occured when trying to save the configuration:

application/views/scripts/config/module-configuration-error.phtml

@@ -5,7 +5,7 @@
 ?>
 <?= $this->tabs->render($this); ?>
 <br/>
-<div>
+<div class="alert alert-error">
   <h1>Could not <?= $action; ?> module "<?= $moduleName; ?>"</h1>
   <p>
     While operation the following error occurred:

application/views/scripts/config/module/show.phtml

@@ -1,4 +1,4 @@
-<table>
+<table class="table table-bordered" >
   <thead>
     <tr style="text-align:left">
       <th width="70%">Module</th>

application/views/scripts/config/resource/modify.phtml

@@ -8,7 +8,7 @@
 <?php endif ?>
 
 <?php if ($this->form->getErrorMessages()): ?>
-<div>
+<div class="alert alert-danger">
   <?php foreach ($this->form->getErrorMessages() as $error): ?>
     <?= $this->escape($error); ?><br/>
   <?php endforeach; ?>

application/views/scripts/config/show-configuration.phtml

@@ -2,7 +2,7 @@
 
 
 <br/>
-<div>
+<div class="alert alert-error">
   <h4><i>WARNING ICON</i>Saving "<?= $this->escape($this->file); ?>.ini" Failed</h4>
   <br/>
   <p>