Fix lupdate issues

Some wrong tr calls / missing tr functions.
Some places where we need to bring lupdate to the right track with
regard to namespace resolution.

Change-Id: Idf552054a34e24d9671db68c816bf37f4d403dbc
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmakeprojectmanager/qmakestep.cpp

@@ -744,7 +744,7 @@ QMakeStepFactory::QMakeStepFactory()
     setSupportedConfiguration(Constants::QMAKE_BC_ID);
     setSupportedStepList(ProjectExplorer::Constants::BUILDSTEPS_BUILD);
     //: QMakeStep default display name
-    setDisplayName(QMakeStep::tr("qmake"));
+    setDisplayName(::QmakeProjectManager::QMakeStep::tr("qmake"));
     setFlags(BuildStepInfo::UniqueStep);
 }