Did you adjust your files to use the init and template prep? If not - that is your issue.
Please investigate and come back - thanks
Sorry for the slow response. I'm on vacation. The {{missing text}} means that whatever language file you are using does not have the key for that menu.
Are you set to English or another language?
I may see if there is any way that I can get credentials and login to see what the problem is myself. A few people have this problem, but I never seem to have enough information to know what's causing it. My first thought is that when you upgraded, your custom files are not calling the right includes.
So right below your line that calls to the users/init.php file,
instead of includes to header.php and navigation.php there should only be one include that looks like this...
require_once $abs_us_root.$us_url_root.'users/includes/template/prep.php';
Some people miss this step in the instructions when they do a lot of updates at once.