🐛 [BUG] Fix missing languages for 'published' field on Touristic Content in APIv2 (#4439)

[Chatewgne]

Description

Related Issue

#4439

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
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[cypress]

Geotrek-admin    Run #10705

Run Properties:   Passed #10705  •  b8b886b66b ℹ️: Merge 3d889a4d6653963747f4ff4f80bb9806e3d9d014 into 4dba2fb8f4dbf97c182d9c27228f...

Project	Geotrek-admin
Branch Review	refs/pull/4440/merge
Run status	Passed #10705
Run duration	02m 07s
Commit	b8b886b66b ℹ️: Merge 3d889a4d6653963747f4ff4f80bb9806e3d9d014 into 4dba2fb8f4dbf97c182d9c27228f...
Committer	Célia
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (4dba2fb) to head (3d889a4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4440   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files         268      268           
  Lines       21290    21293    +3     
=======================================
+ Hits        20964    20967    +3     
  Misses        326      326           

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