Revert form description back to inline format

This is a partial revert from:
* 2d802128ac
* 73a2060b42

public/css/module.less

@@ -888,30 +888,14 @@ form dd.active li.active input.related-action[type='submit'] {
 
 form {
   p.description {
-    color: inherit;
+    color: @gray;
     font-style: normal;
-    position: absolute;
-    bottom: 1em;
-    width: 96%;
-    max-width: unset;
-    margin-left: 13em;
-    max-height: 12em;
-    overflow-x: auto;
-    background: @tr-active-color;
-    border: 1px solid @icinga-blue;
-    border-radius: 0.5em;
-    font-size: 1.2em;
-    right: 2%;
-    color: @icinga-blue;
-    padding-left: 3em;
-    display: none;
-    z-index: 100;
+    padding: 0.5em;
   }
 
   p.description:before {
-    content: '\e881';
+    content: '\e85b';
     font-family: 'ifont';
-    font-size: 1.5em;
     color: @icinga-blue;
     position: absolute;
     margin-left: -1.5em;

public/js/module.js

@@ -608,19 +608,23 @@
             var $dt = $dd.prev();
             var $form = $dd.closest('form');
 
-            var $desc = $dd.find('p.description');
-            if ($desc.length) {
-                $form.css({ marginBottom: ($desc.height() + 48) + 'px' });
-            }
-
             $form.find('dt, dd, li').removeClass('active');
             $li.addClass('active');
             $dt.addClass('active');
             $dd.addClass('active');
+            $dd.find('p.description.fading-out')
+                .stop(true)
+                .removeClass('fading-out')
+                .fadeIn('fast');
 
             $form.find('dd').not($dd)
                 .find('p.description')
-                .hide();
+                .not('.fading-out')
+                .addClass('fading-out')
+                .delay(500)
+                .fadeOut('slow', function () {
+                    $(this).removeClass('fading-out').hide()
+                });
         },
 
         highlightFormErrors: function($container)