[Merge] ~chad.smith/update-notifier:cleanup/translations-livepatch-and-crash into update-notifier:master

[Chad Smith]

Chad Smith has proposed merging ~chad.smith/update-notifier:cleanup/translations-livepatch-and-crash into update-notifier:master.

Commit message:
Fix running debconf-updatepo on master for utf-8 based translations.

Add [encoding: UTF-8] prefix to POTFILES.in definitions for livepatch*c and crash.c.

Add src/system-crash.c to POTFILES.in so it gets translation entries too.

LP: #1901741

Requested reviews:
  Brian Murray (brian-murray)
Related bugs:
  Bug #1901741 in update-notifier (Ubuntu): "debconf-updatepo fails to setup translations due to crash.c, livepatch.c and livepatch-tray.c"
  https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1901741

For more details, see:
https://code.launchpad.net/~chad.smith/update-notifier/+git/update-notifier/+merge/393076
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