#382 - Change display and translations structure for criteria and concepts

[michael-82]

• remove nested declaration from elastic search documents (seems to be unnecessary, but should be monitored)
• modify swagger file to match new responses
• adapt tests to the new structure
• Change responses to codeable concept and terminology replies to the new structure

[codecov]

Codecov Report

Attention: Patch coverage is 82.53968% with 11 lines in your changes missing coverage. Please review.

Project coverage is 78.54%. Comparing base (5792b49) to head (5b7638c).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ty_gui_backend/terminology/TerminologyService.java	0.00%	7 Missing ⚠️
...i_backend/terminology/es/TerminologyEsService.java	55.55%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #384      +/-   ##
=============================================
- Coverage      78.54%   78.54%   -0.01%     
- Complexity       561      566       +5     
=============================================
  Files            138      140       +2     
  Lines           2419     2470      +51     
  Branches         149      151       +2     
=============================================
+ Hits            1900     1940      +40     
- Misses           461      472      +11     
  Partials          58       58              

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