Fixed unescaped of quotes in ARIA labels (#8053)

Author: reteps

src/templates/partials/toc-item.html

@@ -30,7 +30,7 @@
 
   <!-- Table of contents list -->
   {% if toc_item.children %}
-    <nav class="md-nav" aria-label="{{ toc_item.title | striptags }}">
+    <nav class="md-nav" aria-label="{{ toc_item.title | striptags | e }}">
       <ul class="md-nav__list">
         {% for toc_item in toc_item.children %}
           {% include "partials/toc-item.html" %}

src/templates/partials/toc.html

@@ -27,7 +27,7 @@
 {% endif %}
 
 <!-- Table of contents -->
-<nav class="md-nav md-nav--secondary" aria-label="{{ title }}">
+<nav class="md-nav md-nav--secondary" aria-label="{{ title | e }}">
   {% set toc = page.toc %}
 
   <!--