231 fix language functionality

[maciekbanas]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 73.89% and project coverage change: +2.34% 🎉

Comparison is base (1081673) 75.40% compared to head (d98b118) 77.75%.
Report is 68 commits behind head on devel.

❗ Current head d98b118 differs from pull request most recent head a047d98. Consider uploading reports for the commit a047d98 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #265      +/-   ##
==========================================
+ Coverage   75.40%   77.75%   +2.34%     
==========================================
  Files          12       14       +2     
  Lines         992     1353     +361     
==========================================
+ Hits          748     1052     +304     
- Misses        244      301      +57     

Files Changed	Coverage Δ
R/plots.R	0.00% <0.00%> (ø)
R/GitHost.R	55.43% <47.36%> (+10.53%)	⬆️
R/test_helpers.R	75.00% <62.50%> (-8.34%)	⬇️
R/EngineRestGitLab.R	83.98% <77.27%> (-1.87%)	⬇️
R/EngineRestGitHub.R	77.38% <84.51%> (+4.15%)	⬆️
R/EngineGraphQLGitLab.R	92.30% <92.30%> (ø)
R/EngineGraphQLGitHub.R	83.98% <92.68%> (-0.29%)	⬇️
R/GQLQueryGitLab.R	97.67% <97.67%> (ø)
R/EngineGraphQL.R	100.00% <100.00%> (ø)
R/EngineRest.R	93.33% <100.00%> (-0.32%)	⬇️
... and 3 more

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[Cotau]

LGTM, I would just change NULL parameter to some string saying "all" to be more intuitive