Accessibility issues and small bugs

[aviannamiller]

#140 deals with testing of the module functionality for Omeka S v4+. This issue identifies some a11y shortcomings and other small bugs that came up in testing.

• The delete/undo pattern that appears in the form builder and when assigning/unassigning users to a project should be adjusted for proper keyboard focusing (screenreader announcements could more specific, as well).

On dashboard:

• Issue with how categories under projects are displaying on mobile / narrow viewports:
  

On dataset pages:

• .datascribe-filter-select missing label

• Perhaps sidebar expand/collapse is missing aria-expanded? Not getting a great screen reader announcement on this, and aria-label's could be more descriptive (i.e. Collapse/close dataset metadata, Expand/open dataset metadata)

• Narrow viewport / mobile layout behaves oddly if dataset metadata sidebar is closed before viewport is narrowed:

  Sidebar collapsed, then window resized:
  

  Sidebar left open, then window resized:
  

On the form builder on a dataset:

• The field-name only has a contrast of 3.7:1 (needs to be at least 4.5:1). The field-actions buttons are 2.6:1 and the sortable-handle is 1.5:1 (must be at least 3:1).
• Fields are pretty much all missing labels; selects are missing names (which then carries over to the item records).

On record edit pages:

• Fields are pretty much all missing labels; selects are missing names (both in form and sidebar).

[aviannamiller]

On records:

• "null" values display in #e6e6e6, with a contrast of 1.2:1. This should be legible with a contrast of at least 4.5:1. These can be present within the records browse table and individual record show pages.