Reporting: Simplify CSV export localization

[nagpai]

Summary

We currently have a modal popup that allows merchants to choose either the language in the site settings, or another language. This choice appears until they select the Remember checkbox on it. The selection is broken since from the second time onwards the export switches back to English / site settings.

It is better to simplify the localization by:

• Using the site settings language for exports.
• Remove the language selection modal for CSV exports, since it will be no longer relevant.

Tasks to keep track

• Remove modal and language selection in Transactions report export
• Remove modal and language selection in Payouts report export
• Remove modal and language selection in Disputes report export
• Check if language selection settings is needed anymore in the Payouts > Settings page

Notes

• Internal proposal - pdjTHR-4sV-p2
• Related issue - Emailed CSV reports (generated on server/transact platform async) should be localized to merchant/store language - CSV language modal only works first time #9737