Change "table of contents" default icon and text label

Author: mmistakes

_data/ui-text.yml

@@ -6,7 +6,7 @@ en: &DEFAULT_EN
   page                : "Page"
   pagination_previous : "Previous"
   pagination_next     : "Next"
-  toc_label           : "Overview"
+  toc_label           : "On This Page"
   ext_link_label      : "Direct Link"
   less_than           : "less than"
   minute_read         : "minute read"

_includes/toc

@@ -1,6 +1,6 @@
 <aside class="sidebar__right">
 <nav class="toc" markdown="1">
-<header><h4 class="nav__title"><i class="fa fa-{{ include.icon | default: 'book' }}"></i> {{ include.title | default: site.data.ui-text[site.locale].toc_label }}</h4></header>
+<header><h4 class="nav__title"><i class="fa fa-{{ include.icon | default: 'file-text' }}"></i> {{ include.title | default: site.data.ui-text[site.locale].toc_label }}</h4></header>
 *  Auto generated table of contents
 {:toc .toc__menu}
 </nav>