Add ARIA attributes to alerts and status messages

[dac514]

No description provided.

[codecov]

Codecov Report

Merging #19 into dev will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##                dev      #19   +/-   ##
=========================================
  Coverage     32.37%   32.37%           
  Complexity      223      223           
=========================================
  Files            11       11           
  Lines           803      803           
=========================================
  Hits            260      260           
  Misses          543      543

Impacted Files	Coverage Δ	Complexity Δ
inc/dspace/class-admin.php	2.52% <0%> (ø)	41 <0> (ø)	⬇️
inc/class-admin.php	85.22% <0%> (ø)	25 <0> (ø)	⬇️

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