Make Onion Circuits' .desktop file translatable in Transifex

Can we have the strings in the .desktop file translatable?
Like add them to translations on Transifex for a more complete translation.
https://git-tails.immerda.ch/onioncircuits/tree/onioncircuits.desktop

Parent Task: #6470

Original created by @scootergrisen on 15295 (Redmine)

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