Include pass/fail for WCAG 1.4.11 Non-text contrast

[lloydi]

Simple one really - where you have the pass/fail inidicators for text contrast, it would be good to have another row detailing pass/fail for SC 1.4.11 Non-text Contrast (Perhaps this would be enabled in prefs)

[superhighfives]

Hmm, given this is the same contrast as AA large, maybe it would be easier to simply edit the copy for AA+?

For example, could update it from:

- let AAPlusText = "WCAG 2 level AA requires a contrast ratio of at least 3:1 for bold or large text."
+ let AAPlusText = "WCAG 2 level AA requires a contrast ratio of at least 3:1 for bold or large text, and for non-text content like UI."

I've got an issue to better explore the iconography for the AA / AA+ / AAA / AAA+, too, which this could be a part of. #15