BUGFIX: Fix Breadcrumb Style (#3487)

* BUGFIX: Add breadcrumb-item class to Breadcrumb Template.

This fixes the bug, described in the issue #3474

* TASK: Add .idea to .gitignore file

This commit adds the .idea folder to the .gitignore file. So in the feature, the .idea folder will be ignored from git.

* TASK: Adjust template

* TASK: Fix if statement

.gitignore

@@ -22,6 +22,7 @@
 /css/*.css
 /js/*.js
 .vscode
+.idea
 
 # Docker
 var/docker/db/data/*

src/Frontend/Core/Layout/Templates/Breadcrumb.html.twig

@@ -1,7 +1,7 @@
 <span class="sr-only">{{ 'lbl.YouAreHere'|trans }}</span>
 <ul class="breadcrumb" itemscope itemtype="https://schema.org/BreadcrumbList" role="navigation">
   {% for breadcrumb in breadcrumb %}
-    <li{% if loop.last %} class="active"{% endif %} itemprop="itemListElement" itemscope
+    <li class="breadcrumb-item{% if loop.last %} active{% endif %}" itemprop="itemListElement" itemscope
       itemtype="https://schema.org/ListItem">
       {% if breadcrumb.url and not loop.last %}
         {# set the full url or the item link will not validate #}