[Tails-ux] review release notes for 1.4

The release notes for 1.4 are ready for review. That's ticket #9331.

See
https://git-tails.immerda.ch/tails/tree/wiki/src/news/version_1.4.mdwn?h=testing

1.4 will be released on Tuesday 12 so the release notes have to be ready
before that.

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sajolida