fix: I18N could be optional when providing single locale

[ghiscoding]

when using a single locale, we should be able to skip the use of I18N altogether and not have to register it. This should fix the single locale demo that was not yet working

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b2441e6) 22.72% compared to head (7ab7c6d) 22.72%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1129   +/-   ##
=======================================
  Coverage   22.72%   22.72%           
=======================================
  Files           8        8           
  Lines         898      898           
  Branches      316      319    +3     
=======================================
  Hits          204      204           
  Misses        694      694           

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