We need to add image anchoring etc.

This is completely unfinished work but it works

This reverts commit 7468c623.

We could also use `ActiveSupport::Inflector.inflections { |i| i.acronym('EDTF') }`
See https://github.com/fxn/zeitwerk/issues/86

Currently this is only on html index and show.
Edits and json/geojson are still missing

sprintf does not deal well with leading zeros ;-)

This is kinda complete rewrite and has still to be cleaned up