Hi Hanna,
Well, bad news I’m afraid. The file I thought might be being mis-referenced (fwResponsiveMenus.js) is there and doesn’t appear to be the cause of the problem.
My only suggestion is that you create a new site file with the same parameters and structure as your existing one. Create the menu first of all and make sure it works.
Then recreate each page , cutting and pasting from your old site as much as possible to speed things up. At each stage, publish and check that the menu is still working.
In the long run, this may well be easier than trying to debug the existing site.
FW 7.1.3 seems fine at creating the responsive menu in a fresh file. The moment I tried to add that new menu to your site, it stopped working, so something is interfering with it.
I’m sorry I cannot be more help.
Good luck!
MAtt 
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