Problem:
Mega Menu provided by Astra Pro wasn't following the layout on translated pages.
Solution:
Fixed by doing these steps:
1) In WPML -> Settings -> Custom Fields Translation, click "Show system fields" to display the custom fields usually used by plugins and themes, to manage their styles, layouts and related data.
2) Search for "mega" to bring up all the megamenu related fields, there may be several.
3) Set these to "Copy" and save.
4) Then add a test menu item (i.e. custom link) to the menu in Appearance (in default language) and save.
5) Then synchronize menu in WPML -> WP Menus Sync.
Problem:
The secondary language pages show Internal Server Error with different languages in directories language URL format from WPML >> Languages page.
