VCS[Subversion]: Remove LANG=C setting

as it breaks the log output.
Task-number: QTCREATORBUG-1623

src/plugins/subversion/subversionplugin.cpp

@@ -1062,9 +1062,6 @@ SubversionResponse SubversionPlugin::runSvn(const QString &workingDir,
     Utils::SynchronousProcess process;
     if (!workingDir.isEmpty())
         process.setWorkingDirectory(workingDir);
-    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
-    env.insert(QLatin1String("LANG"), QString(QLatin1Char('C')));
-    process.setProcessEnvironment(env);
     process.setTimeout(timeOut);
     process.setStdOutCodec(outputCodec);