only import a selection of samples from the to be imported files

This option is new to translate5.

• In the task template and in the "add task" window of translate5 a new option "select samples" is added.
• With this option one or several ranges of segments can be specified as editable. All other segments are imported too, but are locked and not editable in translate5.
• The specified segment numbers correspond with the segment numbers in Trados or the line numbers in a CSV file (caution: sdlxliff-parsing is reverse engineering due to lack of documention for the format. Therefore it may be necessary in certain unkown cases in the future, to adjust the parser to some specialties of the format, which are currently unknown to the translate5 development team.)