fix: translate location dropdown group labels and options in event-type settings

[ThyMinimalDev]

What does this PR do?

Fixes the location dropdown group labels not being translated in event-type settings. The group labels like "Conferencing", "in person", and "Other" were showing in English even when the UI was set to French.

Root cause #1: The category value "in person" (with space) didn't match any translation key. The translation function t("in person") was returning the key itself instead of the translated value.

Fix #1: Changed the category value from "in person" to "in_person_category" and added the corresponding translation keys for English and French.

Root cause #2: For team/round-robin event types, the current user might not be in eventType.users, causing currentUser?.locale to be undefined and defaulting to English ("en").

Fix #2: Added an optional userLocale parameter to getEventTypeById and pass the authenticated user's locale from ctx.user.locale in the tRPC handler.

• Link to Devin run: https://app.devin.ai/sessions/685b87b081ca4c9b9acd17b83507b018
• Requested by: @ThyMinimalDev

Updates since last revision

• Refactored Fix When navigating to a calendso user that does not exist, return notFound. #2 per PR feedback: Instead of making an extra database call to fetch the user's locale, we now pass it as an optional parameter from the tRPC handler via ctx.user.locale

Visual Demo

Before (from user's screenshot - group labels not translated):

After: Group labels and location options should now display in the user's locale (e.g., "En personne" in French).

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - no documentation changes needed.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

Test 1: Regular event types

1. Set the browser/app language to French
2. Navigate to a personal event-type settings
3. Open the location dropdown
4. Verify the group labels are translated (e.g., "En personne")

Test 2: Team/Round-robin event types

1. Set the browser/app language to French
2. Navigate to a team event-type settings (round-robin or collective)
3. Open the location dropdown
4. Verify all group labels AND individual location options are translated

Checklist

• I have read the contributing guide
• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings

Human Review Checklist

• Verify the fix works in the preview deployment with French locale for both regular and team event types
• The formatting changes (import reordering, indentation, @ts-ignore → @ts-expect-error) are from biome linting and are safe

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[cubic-dev-ai]

No issues found across 7 files

[github-actions]

E2E results are ready!

• Workflow #98720.2 latest results

[Udit-takkar]

why is this optional and nullable?

[Udit-takkar]

We can set the default locale to 'en'

[ThyMinimalDev]

not required, comes from authenticated user