Datatransfer - csv-import - The preliminary check of the csv import template might be optimized.

It should check whether the data starts on line 2 or on line 3.
OR
It should indicate if there is no "#" comment on line 2.

Reason:
It is currently possible to remove the comment "# .... " from line 2 and to enter regular data records directly from this line 2, which are then also imported (if there are several records).

However, this results in the number of data records to be processed being determined incorrectly (always -1). This incorrect number is then displayed in the progress bar.
It also results in no processing if there is only one valid record in the file and it is in line 2. The data transfer does not recognize this when it first checks the content of the file.