Make locked profiles display a lock icon instead of the text “locked”

This involves adding [ForkAwesome](https://forkawesome.github.io/) to the dependencies, even
though it is pulled in via a CDN.

calsocial/static/css/style.css

@@ -8,3 +8,9 @@ footer {
     border-top: 1px dotted black;
     padding-top: 1em;
 }
+
+@media not speech {
+    .sr-only {
+        display: none;
+    }
+}