Fix invalid icon names passed to the icon view helper

application/views/scripts/authentication/login.phtml

@@ -18,7 +18,7 @@
       '</a>'
     ); ?></p>
     <?php elseif ($requiresExternalAuth): ?>
-    <p class="info-box"><?= $this->icon('icon-info'); ?><?= $this->translate(
+    <p class="info-box"><?= $this->icon('info'); ?><?= $this->translate(
       'You\'re currently not authenticated using any of the web server\'s authentication mechanisms.'
       . ' Make sure you\'ll configure such, otherwise you\'ll not be able to login.'
     ); ?></p>

library/Icinga/Web/Widget/FilterEditor.php

@@ -323,7 +323,7 @@ class FilterEditor extends AbstractWidget
             $this->preservedUrl()->with('addFilter', $filter->getId()),
             null,
             array(
-                'icon'  => 'icon-plus',
+                'icon'  => 'plus',
                 'title' => t('Add another filter')
             )
         );
@@ -336,7 +336,7 @@ class FilterEditor extends AbstractWidget
             $this->preservedUrl()->with('stripFilter', $filter->getId()),
             null,
             array(
-                'icon'  => 'icon-minus',
+                'icon'  => 'minus',
                 'title' => t('Strip this filter')
             )
         );
@@ -349,7 +349,7 @@ class FilterEditor extends AbstractWidget
             $this->preservedUrl()->without('addFilter'),
             null,
             array(
-                'icon'  => 'icon-cancel',
+                'icon'  => 'cancel',
                 'title' => t('Cancel this operation')
             )
         );