Add `white-space: nowrap` to all buttons

Annabel Dunstone Grayrequested to merge
60116-fix-button-wrapping into master

Bootstrap removed white-space: nowrap; from all .btns in v4.2.1. This adds it back to all our buttons, since it may result in more bugs

Before After
Screen_Shot_2019-04-05_at_12.28.39_PM Screen_Shot_2019-04-05_at_12.28.27_PM

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60116

Edited by Annabel Dunstone Gray

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