AO3-7582 i18n-ing the csv download help file

[ASalbenblatt]

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Issue

https://otwarchive.atlassian.net/browse/AO3-7582

Purpose

This internationalizes the csv-download help file

Credit

FlyingFalcon (they/them)

[danderson]

I'm not very familiar with the codebase. The change seems reasonable, but a couple of the i18n labels have a typo.

[ASalbenblatt]

Thanks for catching that, I think I misspelled it once and then copy and pasted it around because I made the same mistake in all four csv_downlaod_help_titles lol, should be fixed now though

[danderson]

Looks good!