Rework /doc/encryption_and_privacy/your_data_wont_be_saved_unless_explicitly_asked

That’s also a quite old heritage that would benefit from being rewritten.

Shorten the URL

Reconsider the formulation “Your data won’t be saved unless explicitly asked”, which is quite long. What about talking about “saving no data by default” instead? This should probably be thought in the wider scope of #8948.

Related issues

Related to #8948
Related to #8881 (closed)

Original created by @sajolida on 8949 (Redmine)

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