Bug 34043: Improve translation of CSV header templates

Bug 34043: Improve translation of CSV header templates

This patch reformats serverl CSV header templates so that it's easier to
translate the English strings. The templates now use the [% t("  ") %]
construction to ensure that each string is managed separately.

To test, apply the patch and go to Acquisitions.

- Locate a vendor with a basket and view the basket.
  - Click the "Export as CSV" button. The CSV file you get should be
    well-formatted.
  - Go to basket groups for that vendor and click the "Closed" tab.
    - Click the "Export as CSV" button for one of the baskets. The CSV
      file should be correct.
- Go to Acquisitions -> Late orders.
  - Check some checkboxes in the list of late orders. Click "Export as
    CSV" at the bottom of the page. The CSV file should be correct.

- Go to the catalog's item search page.
  - Perform a search which will return results. On the result page,
    choose "Export all results to -> CSV" and check the resulting CSV
    file.

- Go to Reports -> Statistics Wizards -> Cash register
  - Select "To a file" under "Output" and submit. Check the resulting
    CSV file.
- Go to Reports -> Orders by funds.
  - Choose "To a file" under "Output" and submit. Check the resulting
    CSV file.

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>