[changes-button] Granular i18n for AI summaries

[tsemachh]

Plugin: changes-button · Priority: P2 · Tracked by ROADMAP.md

Problem

Summary locale isn't passed to the adapter.

Proposed solution

Pass the active locale to the summarize adapter.

Acceptance criteria

• Adapter receives locale.
• Reference adapter respects it.
• Documented.

How to claim

Comment on this issue (e.g. "I'd like to work on this") and a maintainer will assign it to you. Open a PR referencing this issue (Closes #<n>). Discuss design questions here or on the Payload Discord #plugins channel.