This thread is resolved. Here is a description of the problem and solution.
Problem:
Navigation menu is not displaying for translated language page.
Solution:
Enabled translations for the header and footer. Then, translating the header and footer fixes the navigation missing issue on translated language page.
Relevant Documentation:
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This is the technical support forum for WPML - the multilingual WordPress plugin.
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Tell us what you are trying to do?
Navigation menu is not displaying
Is there any documentation that you are following?
Your forum's frequently asked questions, regarding the same issue of no navigation menu displaying is what I have read. I have increased the Memory Limits on the Config file, I have uninstalled and reinstalled the plugin.
Is there a similar example that we can see?
In the Advanced Translation Errors page, it reads the following:
I've checked your Website here hidden link and I'm able to see the missing header. Before we investigate this further, I'd like you to know that an "Internal Server Error" is usually a server-related issue. Could you contact your hosting provider and ask them to look into your server logs for you? Also, ask them to update the MySQL version to 5.6+ so that it meets the requirement as described at: https://wpml.org/home/minimum-requirements/
If the issue persists, I would need to take a closer look at your site. So I would need to request temporary access (WP-Admin and FTP) preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed
IMPORTANT: Please, note, a backup is required for security reasons, and to avoid any data loss, you can use the https://wordpress.org/plugins/updraftplus/ plugin for these backup needs.
Your next answer will be private, which means only you and I have access to it.
✙ I would need your permission to de-activate and re-activate Plugins and the Theme and to change configurations on the site if needed. This is also a reason the backup is critical.
I've checked and I noticed that you've not enabled translations for the header and footer. I've enabled it for you here hidden link as shown in the attached screenshot
Now you can translate the header here hidden link and footer here hidden link
Also, I've fixed the "Advanced Translation Editor" issue by editing the main language and re-translate it again. It should work now and could you please check again?