Git commits in Moodle 3.5.0 by Mitsuhiro Yoshida

commit 97627d2783f1df24a43edb75c3c94b1e0da8b64a
Author: Mitsuhiro Yoshida <mits@mitstek.com>
Date:   Thu, 23 Nov 2017 04:22:56 +0800
Tag:    v3.5.0-beta

MDL-60858 feedback: add button style for "Answer the questions" link.