Fix: avoid calling GET /model/schema on translations and trash

[didoda]

This provides a fix on fetchSchema to avoid some buggy calls like GET /model/schema/translations and GET /model/schema/trash.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (45ae058) to head (6e7c325).
⚠️ Report is 5 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1346   +/-   ##
=========================================
  Coverage     99.77%   99.77%           
- Complexity     1502     1503    +1     
=========================================
  Files           102      102           
  Lines          5880     5882    +2     
=========================================
+ Hits           5867     5869    +2     
  Misses           13       13           

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