Improve accessibility for screen readers

[andarilhoz]

Currently i work with a coleague that is blind and make use of a screen reader, and these were some complaints about insomnia experience:

• Dashboard navigation through NVDA doesn't spell the collection names
• When using keyboard only, the Body and Auth options on the RequestPanel will open only the dropdown instead of the edit view
• The MarkText inside textfields are completly unaccessable using keyboard only.

To be honest i just made those changes on my fork and i'm ready to open a pull request with those changes if i got the permission.

Since its my first PR/Discussion/Issue here, i'm sorry if there is some missing info.