Mock react-i18next globally

[imnasnainaec]

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.76%. Comparing base (3910d84) to head (8570ef4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2954      +/-   ##
==========================================
+ Coverage   72.72%   72.76%   +0.03%     
==========================================
  Files         266      266              
  Lines       10200    10200              
  Branches     1196     1196              
==========================================
+ Hits         7418     7422       +4     
+ Misses       2431     2428       -3     
+ Partials      351      350       -1     

Flag	Coverage Δ
backend	82.78% <ø> (+0.08%)	⬆️
frontend	63.40% <ø> (ø)

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[jmgrady]

Reviewed 51 of 71 files at r1, 20 of 20 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)