UX: Add back link on taggroup page (#16700)

* Add back button to taggroup page

* Lint update + enclosing tags

* Linting

Co-authored-by: Penar Musaraj <pmusaraj@gmail.com>

Co-authored-by: Penar Musaraj <pmusaraj@gmail.com>

app/assets/javascripts/discourse/app/templates/tag-groups.hbs

@@ -1,3 +1,8 @@
+<a href="/tags">
+  {{d-icon "chevron-left"}}
+  <span>{{i18n "tagging.groups.back_btn"}}</span>
+</a>
+
 <div class="container tag-groups-container">
   <h2>{{i18n "tagging.groups.title"}}</h2>
 

config/locales/client.en.yml

@@ -3923,6 +3923,7 @@ en:
           description: "You will not be notified of anything about new topics with this tag, and they will not appear on your unread tab."
 
       groups:
+        back_btn: "Back to all tags"
         title: "Tag Groups"
         about_heading: "Select a tag group or create a new one"
         about_heading_empty: "Create a new tag group to get started"