Display Zimfarm error on UI

[benoit74]

Fix #81

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.35%. Comparing base (d170e0e) to head (356ae6b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   46.35%   46.35%           
=======================================
  Files          10       10           
  Lines         384      384           
  Branches       43       43           
=======================================
  Hits          178      178           
  Misses        205      205           
  Partials        1        1           

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