Revert Font Awesome 5 upgrade (#8810)

* Revert "Fix some icon names changed by the Font Awesome 5. (#8796)"

This reverts commit 3f9ec3de82.

* Revert "Migrate to font-awesome 5.0. (#8799)"

This reverts commit 8bae14591b.

* Revert "Fix some icons names, unavailable in fontawesome5 (free license). (#8792)"

This reverts commit b9c727a945.

* Revert "Update the icon name changed by the Font Awesome 5. (#8776)"

This reverts commit 17af4d27da.

* Revert "Add bot icon to bot avatars and migrate to newer version of Font Awesome (#8484)"

This reverts commit 4b794e134d.

package.json

@@ -37,7 +37,6 @@
     "@babel/preset-env": "^7.0.0",
     "@babel/preset-react": "^7.0.0",
     "@babel/runtime": "^7.0.0",
-    "@fortawesome/fontawesome-free": "^5.2.0",
     "array-includes": "^3.0.3",
     "autoprefixer": "^8.6.5",
     "axios": "~0.16.2",
@@ -59,6 +58,7 @@
     "exif-js": "^2.3.0",
     "express": "^4.16.2",
     "file-loader": "^2.0.0",
+    "font-awesome": "^4.7.0",
     "glob": "^7.1.1",
     "history": "^4.7.2",
     "http-link-header": "^0.8.0",