apt-add-repository fails to add key for PPA with non-ASCII name

[Shaun Crampton]

If the terminal is not configured for a UTF-8 locale, the following command fails:

    # sudo add-apt-repository ppa:cz.nic-labs/bird
     The BIRD Internet Routing Daemon PPA (by upstream & .deb maintainer)
     More info: https://launchpad.net/~cz.nic-labs/+archive/ubuntu/bird
    Press [ENTER] to continue or ctrl-c to cancel adding it

    gpg: keyring `/tmp/tmpsbr85z99/secring.gpg' created
    gpg: keyring `/tmp/tmpsbr85z99/pubring.gpg' created
    gpg: requesting key F9C59A45 from hkp server keyserver.ubuntu.com
    gpg: /tmp/tmpsbr85z99/trustdb.gpg: trustdb created
    gpg: key F9C59A45: public key "Launchpad Datov� schr�nky" imported
    gpg: Total number processed: 1
    gpg: imported: 1 (RSA: 1)
    'ascii' codec can't decode byte 0xc3 in position 86: ordinal not in range(128)

I'd expect it to work, but fail to display the characters that aren't supported.

While I have a workaround, which is to switch locale, the context is that I'm trying to instruct the users of my application on how to install the above PPA and that's a lot more complicated if I have to explain to them how to check the locale and install a UTF-8 version of their locale and switch to it.
---
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2014-08-28 (1343 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
Package: software-properties-common 0.96.20.7
PackageArchitecture: all
ProcVersionSignature: Ubuntu 4.4.0-119.143-generic 4.4.114
Tags: xenial
Uname: Linux 4.4.0-119-generic x86_64
UpgradeStatus: Upgraded to xenial on 2016-08-01 (638 days ago)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Shaun Crampton (fasaxc)]

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[Shaun Crampton (fasaxc)]

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[Shaun Crampton (fasaxc)]

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