Remove bug-causing 'Sem.' Portuguese translation

[imnasnainaec]

Our tree browsing expects the head domain to have id Sem, so the fact that there was a Portuguese translation Sem. (and not translated in any other language), the TreeView component misbehaves only when it's in Portuguese.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.63%. Comparing base (e6eb771) to head (179877f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3494      +/-   ##
==========================================
- Coverage   74.67%   74.63%   -0.04%     
==========================================
  Files         285      285              
  Lines       10996    10996              
  Branches     1337     1337              
==========================================
- Hits         8211     8207       -4     
- Misses       2402     2405       +3     
- Partials      383      384       +1     

Flag	Coverage Δ
backend	83.54% <ø> (-0.08%)	⬇️
frontend	66.70% <ø> (ø)

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[andracc]

Reviewed 8 of 8 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[andracc]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)