✏️ Rewrite "optionnal" to "optional" (#1278)

Update the spelling of the word "optionnal" to "optional" in 4 places.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

- **New Features**
	- Made the file type selection optional in the file upload feature.
- **Bug Fixes**
- Addressed issues with color mode synchronization, persistence, and
user reset behavior.
	- Improved caching and bundling of files.
- **Documentation**
- Corrected spelling errors and typos in various documentation files for
better clarity and accuracy.
- **Style**
	- Updated admin display labels for enhanced clarity.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Baptiste Arnaud <baptiste.arnaud95@gmail.com>

packages/embeds/wordpress/trunk/admin/partials/typebot-admin-display.php

@@ -15,7 +15,7 @@
         </div>
 
         <div style="display: flex; flex-direction: column; margin-top: 1rem">
-          <label>Excluded pages (optionnal):</label>
+          <label>Excluded pages (optional):</label>
           <p style="color: gray">Example: /app/*, /user/*, /admin/settings, /app?param=*</p>
           <input name="excluded_pages" value="<?php echo esc_attr(get_option('excluded_pages')); ?>" style="padding: .5rem" />
         </div>
@@ -28,4 +28,4 @@
       </form>
     </li>
   </ol>
-</div>
+</div>