Problem:
The problem here is that the user is unable to edit their content templates using the WPBakery Builder.

Solution:

This was a known issue in our Views plugin and it has since been resolved in the latest version of Views. If you're still experiencing this issue I recommend updating to the latest version of Views/Blocks to resolve the issue.
https://toolset.com/account/downloads/

Problem:

I am trying to insert custom text instead of the "No results found" in a relationship search field.

Solution:

You can override it with WP filter hook gettext, for example:

https://toolset.com/forums/topic/changing-the-no-results-found-text-in-a-relationship-field/#post-2102693

Relevant Documentation:

https://developer.wordpress.org/reference/hooks/gettext/