[bisq-network/bisq] Remove unused i18n strings (#3932)

[niyid]

> NACK
> 
> Running `testPrune` does seem to print correctly `UNUSED:...` properties, but it creates a `displayStrings.pruned.properties` file that is identically to `displayStrings.properties`

Apologies. Fixed. Please do not forget to remove the "waiting for author" label. Regards.

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