Move translation noop to constants.

Change-Id: I8b084374f67d2419abbc1a43b377321fd3041cf5
Reviewed-on: http://codereview.qt.nokia.com/538
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/coreplugin/coreconstants.h

@@ -254,6 +254,8 @@ const char * const ALL_FILES_FILTER      = QT_TRANSLATE_NOOP("Core", "All Files
 
 const char * const VARIABLE_SUPPORT_PROPERTY = "QtCreator.VariableSupport";
 
+const char * const TR_CLEAR_MENU         = QT_TRANSLATE_NOOP("Core", "Clear Menu");
+
 const int TARGET_ICON_SIZE = 32;
 
 } // namespace Constants