Fix the import of descriptions from a shapefile for sensitive areas

[PartyNell]

Description

To import descriptions the shapefile had to define a field "description" but it is impossible because there is more that 10 characteres. Then this PR remove the last n as for Reglementary areas.

Related Issue

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.53%. Comparing base (85802a3) to head (b2ab0d3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5642   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files         274      274           
  Lines       23006    23006           
=======================================
  Hits        22670    22670           
  Misses        336      336           

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[cypress]

Geotrek-admin    Run #17631

Run Properties:   Passed #17631  •  b16b5f919e ℹ️: Merge b2ab0d34722cd92d7d17a92140d10069c50b4fac into 85802a387276ec95d97c36707404...

Project	Geotrek-admin
Branch Review	refs/pull/5642/merge
Run status	Passed #17631
Run duration	02m 10s
Commit	b16b5f919e ℹ️: Merge b2ab0d34722cd92d7d17a92140d10069c50b4fac into 85802a387276ec95d97c36707404...
Committer	Nell Party
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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎