Font Awesome stopped showing, why squares?

Question

css

Hello, for 2 years everything was displayed well, and now all of a sudden the icons of social networks from font awesome began to be displayed as squares. No changes were made.

How to fix? Here is the site , icons in the footer. The font is included in the header:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">

Answer 1

You have a mixture of versions. Version 4 is connected, but you are using 5

Answer 2

The same bullshit. Go to the fontawesome website and sign up. Then paste the script (they now do it not through css, but through js) into the header.
Why this happened, I can't imagine.