[Task]: Streamline internationalisation locales on AMO

[abyrne-moz]

Description

To improve the quality and consistency of localized content by setting thresholds for which locales remain live on the AMO, based on their completion rate of translated strings.

Proposal: https://docs.google.com/document/d/1um86jUpsw--ki0-JVIc3jKt8TrR6uHlcNWIQRpt8CRY/edit?tab=t.0

Acceptance Criteria

  ### Milestones/checkpoints
  - [ ] Ensure that languages with low translation completion rates are removed from AMO (<= 40% translated).
  - [ ] Redirect `es` language translations to `es-ES`

Checks

• [X] If I have identified that the work is specific to a repository, I have removed "repository:addons-server" or "repository:addons-frontend"

┆Issue is synchronized with this Jira Task

[diox]

Threshold for a locale to be removed from AMO: 40% completion in either repos Threshold for a locale to be added to AMO if not already enabled: 80% completion in both repos Both repos should be affected either way.