In the Weglot plugin you can active a debug mode.
To activate the debug mode the steps are:
  • In Weglot.php set WEGLOT_DEBUG to true
  • Create a file content.html on Weglot plugin dir root
add_filter( 'weglot_debug_file', 'path to your file' );
With this filter you can access debug mode from another file instead of :
WEGLOT_DIR . '/content.html'