Feature: System Message Support

[andrewbrazzatti]

Basic support for displaying a system message in the app to allow administrators to notify of upcoming maintenance.

Message is enabled by setting the language code "system-message-enabled" to the value "true". The title of the system message can then be set via "system-message-title" and the description can be set via "system-message-description".

To avoid persistent nagging of users, the message can be dismissed and won't show again on the same browser for a period of 8 hours.

Future versions may move enabling to brand specific configuration and support multiple system message.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (765d179) 70.05% compared to head (8aefdc9) 70.05%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1639   +/-   ##
========================================
  Coverage    70.05%   70.05%           
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  Files          111      111           
  Lines         1870     1870           
  Branches       218      218           
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  Hits          1310     1310           
  Misses         560      560           

Flag	Coverage Δ
frontend-core-lib	52.41% <ø> (ø)
frontend-dashboard	88.07% <ø> (ø)
frontend-export	100.00% <ø> (ø)
frontend-local-auth	100.00% <ø> (ø)
frontend-manage-roles	63.33% <ø> (ø)
frontend-manage-users	59.81% <ø> (ø)
frontend-report	100.00% <ø> (ø)

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