"nmake ts-de" fails on Windows: lupdate error: File 'src/app' does not exist

1. Build Creator in a shadow build directory.
2. In the build directory go to share\qtcreator\translations and call nmake ts-de.
   This will fail:

   	D:\dev\32\MSVC2013\qt-5.5.1\qtbase\bin\qmake.exe -o Makefile.jsonwizard JSONWIZARD_TR_H="D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/jsonwizard_tr.h" TOP_LEVEL="C:/Users/rob/dev/src/creator-3.6-enterprise/qtcreator/share/qtcreator/templates/wizards" C:/Users/rob/dev/src/creator-3.6-enterprise/qtcreator/share/qtcreator/translations/jsonwizard_tr.pro
   	cd C:\Users\rob\dev\src\creator-3.6-enterprise\qtcreator && D:\dev\32\MSVC2013\qt-5.5.1\qtbase\bin\lupdate -locations relative -no-ui-lines -no-sort src/app src/libs src/plugins/analyzerbase src/plugins/android src/plugins/autotoolsprojectmanager src/plugins/baremetal src/plugins/bazaar src/plugins/beautifier src/plugins/bineditor src/plugins/bookmarks src/plugins/clangcodemodel src/plugins/classview src/plugins/clearcase src/plugins/cmakeprojectmanager src/plugins/coreplugin src/plugins/cpaster src/plugins/cppeditor src/plugins/cpptools src/plugins/cvs src/plugins/debugger src/plugins/designer src/plugins/diffeditor src/plugins/emacskeys src/plugins/fakevim src/plugins/genericprojectmanager src/plugins/git src/plugins/glsleditor src/plugins/help src/plugins/imageviewer src/plugins/ios src/plugins/macros src/plugins/mercurial src/plugins/modeleditor src/plugins/perforce src/plugins/plugins.qbs src/plugins/projectexplorer src/plugins/pythoneditor src/plugins/qbsprojectmanager src/plugins/qmakeandroidsupport src/plugins/qmakeprojectmanager src/plugins/qmldesigner src/plugins/qmljseditor src/plugins/qmljstools src/plugins/qmlprofiler src/plugins/qmlprojectmanager src/plugins/qnx src/plugins/qtsupport src/plugins/remotelinux src/plugins/resourceeditor src/plugins/subversion src/plugins/tasklist src/plugins/texteditor src/plugins/todo src/plugins/updateinfo src/plugins/valgrind src/plugins/vcsbase src/plugins/welcome src/plugins/winrt src/shared/clang src/shared/cpaster src/shared/designerintegrationv2 src/shared/help src/shared/json src/shared/modeltest src/shared/proparser src/shared/qtcreator_gui_pch.h src/shared/qtcreator_pch.h src/shared/qtlockedfile src/shared/qtsingleapplication src/shared/registryaccess share/qtcreator/qmldesigner share/qtcreator/welcomescreen share/qtcreator/welcomescreen/widgets D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/mime_tr.h D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/customwizard_tr.h D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/jsonwizard_tr.h D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/qmlwizard_tr.h D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/qtquickwizard_tr.h D:/dev/32/MSVC2013/creator-ts/share/qtcreator/translations/externaltools_tr.h -ts C:/Users/rob/dev/src/creator-3.6-enterprise/qtcreator/share/qtcreator/translations/qtcreator_de.ts
   lupdate error: File 'src/app' does not exist.
   NMAKE : fatal error U1077: "cd": Rückgabe-Code "0x1"
   Stop.
   

Instead, the German ts-file should be generated in the source directory. On Linux, this works correctly.