Replaced i18n.t w/ tpl in v3/settings.js (#13551)
Replaced i18n.t w/ tpl in v3/settings.js (#13551)

refs: TryGhost#13380

- The i18n package is deprecated. It is being replaced with the tpl package.
ErisDS/Ghost,janvt/Ghost,janvt/Ghost,TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost,ErisDS/Ghost,ErisDS/Ghost,e10/Ghost,e10/Ghost