[Bug 1639743] Re: `&` in french translaction "Logiciels & mises à jour" should be escaped as `&`

[Natim]

I am able to reproduce the error every time in a VirtualMachine.
I am available for a demo through a video conf tool if you need help to reproduce.

Steps
=====

1. Install Ubuntu 16.04.2 LTS in French
2. Add Google Chrome sources for instance in /etc/apt/sources.list.d/google.list
3. `apt-get update && apt-get dist-upgrade`
4. In Software & Update accept to get distribution update even when it is not a LTS
5. Run `update-manage -d` and accept to upgrade.

You should see the following error and screenshot.

** Attachment added: "Screenshot of a reproduction of the error."
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1639743/+attachment/4774792/+files/demo.png

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https://bugs.launchpad.net/bugs/1639743

Title:
  `&` in french translaction "Logiciels & mises à jour" should be
  escaped as `&`

Status in software-properties package in Ubuntu:
  Incomplete
Status in update-manager package in Ubuntu:
  Invalid

Bug description:
  When running update-manager in French the "Logiciels & mises à jour"
  sentence make the update-manager to fail with an empty dialog.

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