discourse/lib/http_language_parser.rb

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# frozen_string_literal: true
module HttpLanguageParser
def self.parse(header)
# Rails I18n uses underscores between the locale and the region; the request
# headers use hyphens.
require 'http_accept_language' unless defined? HttpAcceptLanguage
available_locales = I18n.available_locales.map { |locale| locale.to_s.tr('_', '-') }
parser = HttpAcceptLanguage::Parser.new(header)
matched = parser.language_region_compatible_from(available_locales)&.tr('-', '_')
matched || SiteSetting.default_locale
end
end