Fix: issue when generating multilingual missing labels

[syphax-bouazzouni]

sync with ncbo#220 and fix agroportal/project-management#515

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (337dce9) to head (09bc86f).
Report is 27 commits behind head on development.

Files with missing lines	Patch %	Lines
...on_process/operations/submission_missing_labels.rb	93.75%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #164      +/-   ##
===============================================
+ Coverage        81.31%   81.80%   +0.49%     
===============================================
  Files               89      102      +13     
  Lines             6512     6734     +222     
===============================================
+ Hits              5295     5509     +214     
- Misses            1217     1225       +8     

Flag	Coverage Δ
unittests	81.80% <94.87%> (+0.49%)	⬆️

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