Make all .desktop files translatable

I would like for the strings in .desktop files to be translatable.

Could we make sure all the .desktop files for the included software is translatable so Tails can be more fully translated.

Same for:
tails-persistence-setup.desktop
tails-persistence-delete.desktop
tails-installer.desktop
tails-greeter.desktop

Original created by @scootergrisen on 15294 (Redmine)

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