the translation folder was missing
- also add safe guards that really only the desired subfolders will be part of the installer not also files that may exist in the base folder
- fix bug that registry uninstaller settings of the previous version are not replaced when installing new version of the same series
- avoid explicit calls of the name "FreeCAD"
- update example code and description to MSVC 2017 and FreeCAD 0.19git