fix: Preserve ICU warning context across locales

[klaasnicolaas]

Summary

• include the first affected waypoint in both ICU plural branches for route warnings
• keep Chinese translations valid when Crowdin removes the unsupported one category
• make multi-warning summaries more useful in every supported language

Why

Simplified Chinese only supports the ICU other plural category. Crowdin therefore removes one during export. Because {first} previously existed only in one, the exported locale lost that required placeholder.

Validation

• npm run i18n:check
• npm run lint
• npm run type
• npm run build

[vercel]

Deployment failed for project trackdraw with the following error:

Resource is limited - try again in 24 hours (more than 100, code: "api-deployments-free-per-day").

Learn More: https://vercel.com/dutchdronesquad?upgradeToPro=build-rate-limit

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	48.33%	8325 / 17223
🔵	Statements	47.38%	8876 / 18730
🔵	Functions	48.95%	2171 / 4435
🔵	Branches	38.65%	5076 / 13131

File Coverage

No changed files found.

Generated in workflow #2242 for commit 9e4557c by the Vitest Coverage Report Action

[Copilot]

Pull request overview

Updates inspector route warning ICU plural messages so that the “first affected waypoint” placeholder ({first}) is available in both plural branches, preventing locale exports (notably zh-CN) from dropping required placeholders and improving multi-warning summaries.

Changes:

• Add {first} context to the other plural branch for several route warning summaries (steep/hairpin/close-points/spacing-shift/rhythm-break).
• Adjust wording across supported locales so multi-warning summaries include both {count} and {first} where applicable.
• Ensure zh-CN remains valid when Crowdin removes the unsupported one category by keeping {first} in other.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
lang/zh-CN/inspector.json	Adds {first} to other plural branches so Chinese exports remain valid and keep waypoint context.
lang/nl-NL/inspector.json	Improves multi-warning summaries by including starting waypoint context in other branch text.
lang/en-US/inspector.json	Improves multi-warning summaries by including starting waypoint context in other branch text.
lang/de-DE/inspector.json	Improves multi-warning summaries by including starting waypoint context in other branch text.

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