Include series data in tsv and excel export files

Currently, JSON exports already include series data.
I would like to suggest that the tsv and excel export files also include series data, so users can have a more complete record of their collections when working with these files.

Additionally, it would be great if the language of the series data in the export files, when available, matched the language setting of the website.

I'll pass your suggestion along to the developers, thanks!