Align PReP descriptions with other partition types

Pascal Hambourgrequested to merge
pham/partman-prep:visuals into master
  • Add and use short description in main partitioning dialog
  • Use long description in usage selection dialog
  • Remove unused template

An amd64 build is available at https://salsa.debian.org/pham/partman-prep/-/commits/description_template?ref_type=heads for testing.

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