For i18n ui langauges, add Portuguese and fallbacks

[imnasnainaec]

This change is 

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (ca31782) 49.52% compared to head (5e7efa8) 49.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2140      +/-   ##
==========================================
+ Coverage   49.52%   49.53%   +0.01%     
==========================================
  Files         294      294              
  Lines        9493     9494       +1     
  Branches      694      694              
==========================================
+ Hits         4701     4703       +2     
+ Misses       4237     4236       -1     
  Partials      555      555              

Flag	Coverage Δ
backend	72.08% <ø> (ø)
frontend	33.46% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/i18n.ts	0.00% <ø> (ø)
src/types/writingSystem.ts	100.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[jasonleenaylor]

Reviewed 6 of 6 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)