Update custom template label in options.html

src/options/options.html

@@ -25,7 +25,7 @@ <h1>Options Page</h1>
             <input type="radio" id="custom-template" name="summary-options" value="custom-template">
         </div>
         <div id="input-container-custom-template" class="input-container-row">
-            <label class="input-label" title="Enter a custom template for the markdown summary. Use placeholders for dynamic content. Available placeholders are:&#13&#13{{% links %}}&#13{{% links_h1 %}}&#13{{% links_h2 %}}&#13{{% links_h3 %}}&#13{{% links_h0 %}}&#13{{% attachments %}}&#13{{% images %}}&#13{{% ticket_id %}}&#13{{% ticket_url %}}" for="custom-template-text">Custom Template:</label>
+            <label class="input-label" title="Enter a custom template for the markdown summary. Use placeholders for dynamic content. Available placeholders are:&#13&#13{{% links %}}&#13{{% links_h1 %}}&#13{{% links_h2 %}}&#13{{% links_h3 %}}&#13{{% links_h0 %}}&#13{{% attachments %}}&#13{{% images %}}&#13{{% ticket_id %}}&#13{{% ticket_url %}}&#13{{% ticket_subject %}}" for="custom-template-text">Custom Template:</label>
             <textarea id="custom-template-text" placeholder="{{% links %}}\n{{% attachments %}}\n{{% images %}}\n{{% ticket_id %}}\n{{% ticket_url %}}" disabled></textarea>
         </div>
     </div>