feat: use plural when there are several sponsors

[gnufede]

No description provided.

[Copilot]

🟡 Changes recommended

The UI now selects sponsors.community_plural when there are multiple community sponsors, but that translation key is missing in all locales, causing the community tier title to render empty/undefined.

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Pull request overview

This PR updates the sponsors section to display tier titles in singular vs plural depending on how many sponsors exist in each tier, aligning the UI copy with the actual sponsor counts.

Changes:

• Added new *_plural i18n keys for sponsor tiers (platinum/gold/silver/bronze) across es, en, and ca.
• Updated the home sponsors section to choose between sponsors.<tier> and sponsors.<tier>_plural based on the number of sponsors in that tier.

File summaries

File	Description
src/i18n/home.ts	Adds plural tier labels used by the sponsors section; currently missing sponsors.community_plural needed by the new selection logic.
src/components/home/SectionSponsors.astro	Switches sponsor tier heading key based on sponsor count (> 1 uses the _plural key).

Review details

Suppressed comments (2)

src/i18n/home.ts:65

• SectionSponsors.astro builds the plural key sponsors.community_plural when there is more than one community sponsor, but this locale block doesn't define that key, so the group title will render empty/undefined for the community tier.

    'sponsors.bronze': 'Bronze Sponsor',
    'sponsors.bronze_plural': 'Bronze Sponsors',
    'sponsors.community': 'Sponsoring Communities',
    'sponsors.none': 'No sponsors in this tier',

src/i18n/home.ts:112

• SectionSponsors.astro builds the plural key sponsors.community_plural when there is more than one community sponsor, but this locale block doesn't define that key, so the group title will render empty/undefined for the community tier.

    'sponsors.bronze': 'Patrocinador Bronze',
    'sponsors.bronze_plural': 'Patrocinadors Bronze',
    'sponsors.community': 'Comunitats Patrocinadores',
    'sponsors.none': 'No hi ha patrocinadors en aquest nivell',
    'sponsors.altlogo': 'Logo de {name}',

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Lite

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