For every layout file that you want to load those fonts, include the FontAsset.
The AssetBundle is basically a bundle of CSS and/or JS files and options. You could add another one for say JWPlayer say named VideoAsset, and add your JS/CSS files for JWPlayer in it.
Point being, you shouldn't be adding these things directly into the HTML of the layouts directly, as it can cause problems. Let the AssetManager handle them by declaring AssetBundles.
It might save you later down the road!