I18n.translations ||=
  en:
    readmore:
      button_text:
        open: 'Read more'
        close: 'Read less'

  de:
    readmore:
      button_text:
        open: 'Open'
        close: 'Close'

I18n.translations ||=
  en:
    readmore:
      button_text:
        open: 'Read more'
        close: 'Read less'

  de:
    readmore:
      button_text:
        open: 'Mehr lesen'
        close: 'Weniger lesen'

  fr:
    readmore:
      button_text:
        open: 'Lire la suite'
        close: 'Afficher moins'

Add de and fr translations.
Add de and fr translations.