Approvals required title not aligned on small screens

Summary

'Approvals required' header is centered on small screens, but 'Approved by' section isn't

Screen_Shot_2017-06-16_at_7.58.47_pm_copy

On xs (<400px) screens some things wrap and some overflow

Screen_Shot_2017-06-16_at_8.05.05_pm_copy

From screenshot in https://gitlab.com/gitlab-org/gitlab-ce/issues/33651, originally from https://gitlab.com/gitlab-org/gitlab-ce/issues/32896

Edited by Coung Ngo