tails-installer fails to operate in Turkish

Originally created by @CyrilBrulebois on #17576 (Redmine)

Reported through #tails-dev: with Tails 4.4.1 configured in Turkish, it’s not possible to copy successfully.

Reproduced locally in a VM: a Unicode decoding error in gui.py:266. Removing the try/catch around the relevant code block to pinpoint the exact location, here’s what I get:

amnesia@amnesia:~$ tails-installer
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/dist-packages/tails_installer/gui.py", line 238, in run
    self.live.install_bootloader()
  File "/usr/lib/python2.7/dist-packages/tails_installer/creator.py", line 1092, in install_bootloader
    'syslinux', self.drive['device']))
  File "/usr/lib/python2.7/dist-packages/tails_installer/creator.py", line 297, in popen
    % {'command': cmd, 'filename': self._error_log_filename})
TailsInstallerError: Şu komut yürütülürken bir sorun çıktı: `/tmp/tmpD4dp3J/syslinux  -d syslinux /dev/sda1`.
Ayrıntılı bir hata raporu '/tmp/tails-installer-2ViLtr' dosyasına yazıldı.

Out the blue, I’d assume this isn’t related to #17568 (closed)…

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