(Accessibility) Viz type selection button should read more clearly in screenreader

[bhavyarm]

Steps to reproduce (assumes ChromeVox or similar)

1. Use keyboard and voiceover and open visualize app and
2. click on create visualization button or on plus sign

Actual Result

4. Screenreader reads are area button, co-ordinator map button

Expected Result

4. Screenreader can read create area chart...create input controls etc instead of reading the button

Meta Issue
#28599

Kibana Version: 6.6.0 BC9

Relevant WCAG Criteria: [#.#.# WCAG Criterion](link to https://www.w3.org/WAI/WCAG21/quickref/?versions=2.0)

[elasticmachine]

Pinging @elastic/kibana-app

[timroes]

I would actually recommend not doing that, for a specific reason. We could easily rename every button in Create {vistype} visualization. I (a) don't think it's necessary, because the user is already in the New visualization dialog, and selected a button to create a new visualization already, so I think that additional context is not needed and more important (b) I've seen blind users often use their screen reader in a way, that they use the link search to navigate through that kind of link lists efficiently. If we suddenly make all links start with the same word and such the same character, you cannot easily use that feature anymore to press P to jump directly to the pie chart link.

So my suggestion would be, leaving that as it is with just the vis type name as a label, but I am happy to hear more opinions on that topic.

[PhilippBaranovskiy]

@bhavyarm, now the screen reader explains what Coordinate Map means/does if you choose the option.
For instance, it "plots latitude and longitude coordinates on a map" screen reader says.

1: That was added by @timroes by that commit: b172649f347
I agree with Tim's thought that unique first word provides a possibility for a quick jump by a keyboard.
I suggest that we should leave it as it is now.

2: On the other hand, when a user press "create a new visualization" button, the popover opens and auto-focuses, -- at the moment the popover gets auto-focus no annoncement is out there.
I suggest that I should place an aria-label with some explanation on it.

How does it sound? What do you think?

cc @rayafratkina