Change the button that dismissess upload errors so it appears after the relevant errors. Change button from icon-only to text-based. Removes ambiguity about what you are cancelling when using the control.
Props ComputerGuru, melchoyce, vdwijngaert, alexislloyd, joedolson, shaunandrews, sabernhardt.
Fixes#42979.
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git-svn-id: http://core.svn.wordpress.org/trunk@51788 1a063a9b-81f0-0310-95a4-ce76da25c4cd
