I18n best practice for filters

After reading #111 and #158 creating a custom date filter seems the way to go to translate day and month names.

My current solution contains passing the locale through the registers option on Template#render:

liquid = Liquid::Template.parse(source)
liquid.render(assigns, filters: [Extensions::Liquid::DateFilter], registers: { locale: :de })

and then I'm able to access it via the @context variable in the filter:

module Extensions
  module Liquid
    module DateFilter
      def date(input, format)
        return input if format.to_s.empty?

        return input unless date = to_date(input)

        I18n.l(date, format: format.to_s, locale: @context.registers[:locale])
      end
    end
  end
end

My question is: is this the "correct" way to achieve the desired result? Or is there a "better" intended way to do this?

Read issues #111 and #158 first to understand the existing guidance on translating day and month names. Then review the custom date filter and the Template#render registers option shown here; the work is done when the intended i18n approach is established and documented clearly.