refactor: update '<' to '< back' button

Author: devvaannsh

src/extensionsIntegrated/CustomSnippets/htmlContent/snippets-panel.html

@@ -10,7 +10,7 @@
             </div>
             <div id="back-to-list-menu-btn" class="custom-snippet-btn hidden">
                 <button title="Back to snippets list">
-                    <i class="fas fa-chevron-left"></i>
+                    <i class="fas fa-chevron-left"></i> Back
                 </button>
             </div>
         </div>