D11238: filemetadatawidgettest: Enforce en_US locale

[Michael Heidelbach]

michaelh edited the summary of this revision.

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D11238

To: michaelh, elvisangelaccio, #baloo, #frameworks
Cc: ashaposhnikov, spoorun, nicolasfella, alexeymin
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