mitk::DicomSeriesReader uses ITK DICOM readers (GDCM or DICOMImageIO) to read DICOM images. In T2473 we found out that at least the GDCM reader is related to number parsing errors which are locale dependent.
mitk::DicomSeriesReader does currently not ensure that a working locale ("C") is used while reading files.
The solution implemented for T2473 should be moved from DataTreeNodeFactory to DicomSeriesReader to ensure correct parsing even for users who use the reader directly.