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mastodon/app/controllers/concerns/localized.rb

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# frozen_string_literal: true
module Localized
extend ActiveSupport::Concern
included do
before_action :set_locale
end
private
def set_locale
I18n.locale = default_locale
I18n.locale = current_user.locale if user_signed_in?
rescue I18n::InvalidLocale
I18n.locale = default_locale
end
def default_locale
ENV.fetch('DEFAULT_LOCALE') do
user_supplied_locale || I18n.default_locale
end
end
def user_supplied_locale
http_accept_language.language_region_compatible_from(I18n.available_locales)
end
end