Bootstrap's dependency on fonts.googleapis.com causes Mayan EDMS web interface load slowly if public internet is unreachable

After loosing my internet connection my locally hosted Mayan site became sluggish with page loads taking about 80 seconds.

The Firefox network analyzer reported the GET https://fonts.googleapis.com/css?family=Lato:400,700,400italic request was the culprit; fonts.googleapis.com was unreachable.

I see http://<mayan.mydomain>/static/appearance/packages/bootswatch.com/flatly/bootstrap.min.css has the following statement: @import url("https://fonts.googleapis.com/css?family=Lato:400,700,400italic");

Firefox was attempting to fetch this file before loading the page's main contents.

Is there a way to remove the dependency on fonts.googleapis.com?