Natalie Tay d54cd1f602
DEV: Normalize locales that are similar (e.g. en and en_GB) so they do not get translated (#1495)
This commit
- normalizes locales like en_GB and variants to en. With this, the feature will not translate en_GB posts to en (or similarly pt_BR to pt_PT)
- consolidates whether the feature is enabled in `DiscourseAi::Translation.enabled?`
- similarly for backfill in  `DiscourseAi::Translation.backfill_enabled?`
  - turns off backfill if `ai_translation_backfill_max_age_days` is 0 to keep true to what it says. Set it to a high number to backfill everything
2025-07-09 22:21:51 +08:00
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