Replaced i18n with tpl core/server/api/canary/session.js (#13487)
Replaced i18n with tpl core/server/api/canary/session.js (#13487)

refs: #13380

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