Horizontal scrollbar on issue pages with small viewport

Summary

The issue action timestamp information stays in one line independent of the available display space. Please have a look at the screenshots.

Steps to reproduce

Visit https://gitlab.com/gitlab-org/gitlab-ce/issues/37900 with a smaller viewport (<450px)

Relevant logs and/or screenshots

Possible fixes

Removing the following line fixes the issue. But i think it´s there for a reason.

.note-headline-meta {
    white-space: nowrap;
}