fix: Add Estonian to settings language options (#13936)

Adds Estonian to the settings language dropdown so accounts can select
the existing `et` translation from the UI.

Fixes: N/A
Closes: N/A

## Why
Estonian translation files already exist in the repo and in Crowdin, but
the settings dropdown is driven by `LANGUAGES_CONFIG`, where `et` was
missing.

## What this change does
- Adds `et` / `Eesti (et)` to `LANGUAGES_CONFIG`
- Makes Estonian available in the settings language selectors backed by
`enabledLanguages`

## Validation
- `ruby -c config/initializers/languages.rb`
- Opened the local UI at `/app/accounts/1/settings/general` and verified
`Eesti (et)` appears in the `Site language` dropdown

---------

Co-authored-by: Pranav <pranav@chatwoot.com>

config/initializers/languages.rb

@@ -42,7 +42,8 @@ LANGUAGES_CONFIG = {
   37 => { name: 'עִברִית (he)', iso_639_3_code: 'heb', iso_639_1_code: 'he', enabled: true },
   38 => { name: 'lietuvių (lt)', iso_639_3_code: 'lit', iso_639_1_code: 'lt', enabled: true },
   39 => { name: 'Српски (sr)', iso_639_3_code: 'srp', iso_639_1_code: 'sr', enabled: true },
-  40 => { name: 'български (bg)', iso_639_3_code: 'bul', iso_639_1_code: 'bg', enabled: true }
+  40 => { name: 'български (bg)', iso_639_3_code: 'bul', iso_639_1_code: 'bg', enabled: true },
+  41 => { name: 'Eesti keel (et)', iso_639_3_code: 'est', iso_639_1_code: 'et', enabled: true }
 }.filter { |_key, val| val[:enabled] }.freeze
 
 Rails.configuration.i18n.available_locales = LANGUAGES_CONFIG.map { |_index, lang| lang[:iso_639_1_code].to_sym }