All I have been able to pick up is that in the template.css file it is:
.pagenav li > a span.icon-chevron-left {
display: block;
}
.pagenav li > a span.icon-chevron-left:before {
content: "\f104";
}
.pagenav li > a span.icon-chevron-right {
display: block;
}
.pagenav li > a span.icon-chevron-right:before {
content: "\f105";
In font-awesome.css it is :
.fa-angle-left:before {
content: "\f104";
}
.fa-angle-right:before {
content: "\f105";
I do not know if the difference of 'icon' and 'fa' are relevant to the problem.