Pascal Birchler 5a10b5c879 Administration: Fix minor misalignments caused by the button-link CSS class.
After [40059] the CSS class `button-link` uses `text-align: left` by default.
This change now requires to limit as much as possible the use of `button-link`
to controls that should really look like links and to explicitly set
`text-align: center` in a few other cases.

Fixes #39983.

Merges [40358] to the 4.7 branch.

Built from https://develop.svn.wordpress.org/branches/4.7@40367


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