fix: schedule subnav page translations

[emmambd]

This PR includes translations for submenu pages under Examples in https://gtfs.org/schedule/examples/translations/, including:

• Example GTFS Feed
• Fares v1
• Fares v2
• Frequencies
• Pathways
• Translations
• Routes, stops, trips
• Continuous stops
• Text to speech
• Attributions
• Feed info

As well as the Changes and Validate pages.

It should be noted there seems to be recurring issues with Simpleen in deleting links (maybe an issue with markdown?) and not honouring glossary do not translate items, particularly for languages without the Latin alphabet. These have been resolved manually.

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[isabelle-dr]

@josee-sabourin and @emmambd this is truly incredible 😍
This PR alone brings so much (so much!) value out there.
Are we going to announce this somewhere? LinkedIn? blogpost?

[emmambd]

A big shoutout to @josee-sabourin for pitching in on this!

Since we already announced that we had translations on the website available, I don't think there's any new value for the community in sharing it. (I also still have to do the realtime example PR 😅)

I will do some brainstorming with Tu-Tho about how we could identify community members who would want to do translation reviews once every 3-6 months, once realtime is wrapped up as well.