Loads Rails locale-specific pluralization rules so languages with an
`other`-only plural model can safely use Crowdin exports without
maintaining duplicate `one` keys.
## Closes
None
## Why
Crowdin exports Rails YAML pluralized strings using each target
language's plural categories. These categories come from Unicode CLDR
and represent grammatical forms, not a literal "number is 1" bucket.
Some languages need separate forms such as `one` and `other`, but
languages like Japanese, Korean, Indonesian, Thai, Vietnamese, and
Chinese use the same form for `1`, `2`, `5`, and larger counts in these
strings. For those locales, CLDR correctly models the plural category as
`other` only.
Before this change, Chatwoot still relied on Rails' default
English-style plural behavior for these locales. That meant a valid
Crowdin export containing only `other` could fail at runtime when Rails
received `count: 1` and looked for a missing `one` branch.
Keeping duplicate `one` keys would only fight Crowdin on every
translation sync. The runtime should instead follow the locale's plural
rules.
## What changed
- Added `rails-i18n` and enabled only its pluralization module.
- Added explicit `other`-only plural rules for Chatwoot's underscore
Chinese locale aliases, `zh_CN` and `zh_TW`.
- Removed redundant `one` keys from the affected Devise and `time_units`
translations.
## Validation
- Ran a Rails runner check across `id`, `ja`, `ko`, `ms`, `th`, `vi`,
`zh_CN`, and `zh_TW` to verify `errors.messages.not_saved` and
`time_units.days` resolve with only `other` for `count: 1`.
- Ran YAML parse validation for all edited locale files.
- Ran `bundle exec rubocop Gemfile config/application.rb
config/initializers/i18n_pluralization.rb`.
This updates the Traditional Chinese (`zh_TW`) locale coverage across
Chatwoot so the app no longer falls back to English for missing backend,
dashboard, widget, and survey strings.
## How to test
1. Start Chatwoot locally and switch the UI locale to Traditional
Chinese (`zh_TW`).
2. Walk through the main product areas: dashboard, settings, inbox
management, help center, automations, reports, widget, and survey flows.
3. Confirm the UI surfaces translated Traditional Chinese copy instead
of English fallbacks.
4. Spot-check newly added locale surfaces such as secure password
messaging and snooze UI copy.
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Co-authored-by: Sojan Jose <sojan@pepalo.com>
