driverless printing generates wrong language/encoding PPD

[Naruhiko Ogasawara]

The printing option dialog (see attached PNG file) is broken with Bionic Japanese environment.
This issue seems to be coming from the generated PPD file with wrong language/encoding.

I tried with Epson EP-879AW.

Steps to reproduce:

1) generate a print queue by driverless feature with ja-JP locale:

$ LANG-ja_JP.UTF-8 lpadmin -p driverlesstest-ja -E -v `driverless` -m everywhere

2) check the generated PPD (attached driverlesstest-ja.ppd)

$ sudo less /etc/cups/ppd/driverlesstest-ja.ppd

Expected: PPD have same language/encoding with content (if the content have Japanese, language/encoding should be Japanese/UTF-8)

Actual: PPD has Japanese strings, but language/encoding is English/ISOLatin1

----
Attached files:

EPSON_EP_879A_Series_007.png: screenshot of printing option dialog of EP-879AW driverless print queue
driverless-ja.ppd: PPD generated with ja_JP.UTF-8 locale
driverless-en.ppd: PPD generated with C locale
ipptool.txt: output of ipptool, by following command:

$ ipptool -tv `driverless` get-printer-attributes.test > ipptool.txt

[Naruhiko Ogasawara (naruoga)]

CUPS generate non-globalized PPD in this context, so I believe it should put LanguageVersion/LanguageEncoding as follows the locale of strings, not hard-code to English/ISOLatin1.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.