update the description of "CABLE_CAR" mode to cable tram.

[miklcct]

Summary

A cable car, in GTFS terminology which uses American English, is a rail vehicle running on street propelled by a cable.
However, in British English, the term "cable car" has a completely separate meaning which has caused confusion,
and the official specification has been updated to use the term "cable tram" as a result.

This changes all references to "cable car" to "cable tram" in the UI code and documentations.
However, it isn't possible to change the name of the enum item without breaking backward compatibility.

Issue

google/transit#186

Unit tests

None, as this is a pure documentation change.

Documentation

Updated

[t2gran]

These changes are good, but we do not want the changes in application/src/client/classic-debug. The reason is simply that we do not maintain/support the old ui any more. It is soon going to be deleted from the codebase, so it is waist of time to review it.

The other changes are good!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.93%. Comparing base (440498f) to head (52baf4d).
Report is 71 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6173      +/-   ##
=============================================
- Coverage      69.93%   69.93%   -0.01%     
+ Complexity     17730    17726       -4     
=============================================
  Files           1996     1996              
  Lines          75402    75402              
  Branches        7717     7717              
=============================================
- Hits           52731    52729       -2     
- Misses         19995    19996       +1     
- Partials        2676     2677       +1     

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