Andrea Fercia 1f92cbb9c6 Accessibility: Improve the differences between revisions.
Color alone is not sufficient to visually communicate differences.

- adds `plus` and `minus` icons to the changed lines
- adds visually hidden text: `Added`, `Deleted`, and `Unchanged` to clarify the differences to assistive technologies users

Props birgire, audrasjb, kjellr, adamsilverstein.
Fixes #43532.


git-svn-id: https://develop.svn.wordpress.org/trunk@45729 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-03 15:45:06 +00:00
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