Events/i18n: Remove start/end display times from protos

[tristanlabelle]

Localization of datetimes should happen on the frontend, which can decide what format to use based on the context (e.g. abbreviated months, weekdays or not). The backend-provided time display value was not localized properly and unused. Better just remove it.

Testing

This was dead code. Tests should cover regressions.

Backend checklist

• Added tests for any new code or added a regression test if fixing a bug
• Run the backend locally and it works
• Added migrations if there are any database changes, rebased onto develop if necessary for linear migration history

Web frontend checklist

• There are no console warnings when running the app
• Added tests where relevant
• Clicked around my changes running locally and it works
• Checked Desktop, Mobile and Tablet screen sizes

For maintainers

• Maintainers can push commits to my branch
• Maintainers can merge this PR for me

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Project	Deployment	Actions	Updated (UTC)
couchers	Ready	Preview	May 7, 2026 5:48am

[aapeliv]

lgtm but i think you got the proto syntax a bit wrong

[tristanlabelle]

@aapeliv Fixed the protobuf syntax error.

[aapeliv]

lgtm, thanks for the cleanup!

[github-actions]

📝 Release Notes

This PR does not need to be included in release notes.

Reason: This PR removes unused backend protobuf fields for event time display and shifts localization responsibility to the frontend. It is described as dead code cleanup, with no new user-facing feature, noticeable UX change, or significant platform-level technical improvement called out for end users.

🤖 Bot Debug Information

Model: couchers.openai.gpt-5.4
Decision: exclude
Reasoning: This PR removes unused backend protobuf fields for event time display and shifts localization responsibility to the frontend. It is described as dead code cleanup, with no new user-facing feature, noticeable UX change, or significant platform-level technical improvement called out for end users.