Fixing messages when uninstalling plugins

[thiagoaugusto]

Description of what you did:

Fixing messages when uninstalling plugins #5490

[codecov]

Codecov Report

Merging #6463 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6463   +/-   ##
=======================================
  Coverage   19.85%   19.85%           
=======================================
  Files         857      857           
  Lines       12076    12076           
  Branches     1963     1963           
=======================================
  Hits         2398     2398           
  Misses       8093     8093           
  Partials     1585     1585           

Flag	Coverage Δ
#front	14.66% <ø> (ø)
#unit	41.26% <ø> (ø)

Impacted Files	Coverage Δ
...admin/src/containers/InstalledPluginsPage/index.js	7.14% <ø> (ø)
...ntent-type-builder/controllers/validation/types.js	52.27% <0.00%> (ø)

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[soupette]

LGTM!

Thanks for taking the time to contribute to the project!