Draft: #3590577 Language preview for templates

Ben Mullinsrequested to merge
issue/canvas-3590577:3590577-extend-language-swit into 1.x
  • Templates need to first support preview in general
  • While in template context, the language switcher should go to the translated template preview

Testing instructions

  • First step for someone to test the changes in this MR

Closes #3590577

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