Facebook icon in top navigation menu not showing

hi,
we have issue with facebook icon in top navigation menu. we change it:

.icon-facebook {font-size: 28px;}

.icon-facebook:before {
    content: "\f082";
    font-family: FontAwesome;
    font-style: normal;
    font-weight: normal;
    text-decoration: inherit;
}

to get bigger and squerd icon. On my computer i can see icon but on others theres only outlined square.
can you help us with this?
Screenshots:
Facebook icon visible (only on my comp): image

Facebook icon like square (like everybody see it):
image
tnx

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