files: Avoid crash if `fileinfo` extension missing
forms: Properly export choices lists

Previously, this was not ported properly now that multiple selections are
supported in the choice field and derivatives.
i18n: Clarify attachment settings labels
Disable auto-responses on staff created tickets

Take into consideration the auto-response settings when sending out new
ticket by staff notice to the end user.
pdf: Fix invalid UTF-8 characters error message
Merge pull request #1512 from greezybacon/issue/pdf-invalid-utf

pdf: Fix invalid UTF-8 characters error message

Reviewed-By: Peter Rotich <peter@osticket.com>
Merge pull request #1489 from greezybacon/issue/more-phrases

i18n: Clarify attachment settings labels

Reviewed-By: Peter Rotich <peter@osticket.com>
Merge pull request #1509 from protich/issue/disable-auto-response

Disable auto-responses on staff created tickets

Reviewed-By: Jared Hancock <jared@osticket.com>
Merge pull request #1437 from greezybacon/issue/1427

files: Avoid crash if `file info` extension missing

Reviewed-By: Peter Rotich <peter@osticket.com>
Merge pull request #1436 from greezybacon/issue/choices-export

forms: Properly export choices lists

Reviewed-By: Peter Rotich <peter@osticket.com>