D18178: fix environment setup of klanguagename test

[Harald Sitter]

sitter created this revision.
sitter added reviewers: aacid, rikmills.
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REVISION SUMMARY
  - use correct env vars LANG and LANGUAGE
  - as an additional safety-net explicitly set QLocale default to english
  
  (the latter kinda overrides the former, but better save than sorry since it
  has no adverse effects to do both)
  
  this should make tests pass regardless of potentially weird env states some
  CIs may have

TEST PLAN
  test passes on kubuntu ci. my theory is that QLocale picked the default before the env was set up and therefore used `C` instead of `en` thus bypassing the en=>en_US coercion

REPOSITORY
  R265 KConfigWidgets

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18178

AFFECTED FILES
  autotests/klanguagenametest.cpp

To: sitter, aacid, rikmills
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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