Allow Open Sans to be disabled per language. props dimadin. fixes #26063.

git-svn-id: https://develop.svn.wordpress.org/trunk@26376 602fd350-edb4-49c9-b593-d223f7449a82
Use dashicons.min.css for concantenation requests. See #26250


git-svn-id: https://develop.svn.wordpress.org/trunk@26377 602fd350-edb4-49c9-b593-d223f7449a82