Fix default via vertex name translation mapping

[optionsome]

Summary

Default name for a via vertex is now properly used instead of exposing a translation key. This problem was introduced in #6972.

There is also a minor refactoring so that we don't need to maintain list of internals translation keys in code.

Issue

No issue as minor problem.

Unit tests

Improved test coverage.

Documentation

No

Changelog

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.19%. Comparing base (17e7f49) to head (ca110c4).

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #7046      +/-   ##
=============================================
- Coverage      72.19%   72.19%   -0.01%     
+ Complexity     20140    20137       -3     
=============================================
  Files           2184     2184              
  Lines          81154    81154              
  Branches        8145     8145              
=============================================
- Hits           58588    58587       -1     
  Misses         19687    19687              
- Partials        2879     2880       +1     

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