Update translations.txt after Fares v2 addition into GTFS

[isabelle-dr]

Describe the problem

translations.txt is a GTFS file that allows producers that operate in regions that have multiple official languages to provide translations to user-facing names.
Several features of the GTFS Fares v2 extension project have been adopted in GTFS recently, and some of them apply to the scope of translations.txt.

Use cases

Allowing to match the fare product name and potentially the fare media name to the names used by the agency rider-facing information, in places where several official languages exist.

Proposed solution

Extend the translations.txt file with:

• fare_product_name: The name of the fare product as displayed to riders.
• fare_media_name: Name of the fare media (e. g. Clipper card).

We need a producer and a consumer to be able to adopt this in GTFS. If you are either and you're interested in supporting this, please comment on this issue or write us at specification@mobilitydata.org.

Additional information

First GH issue opened with the new template 🏄, this is great!