1
Add Languages
In any template, English (en) language in enabled by default. To add other languages, click on 
This will open language selection modal. Search the required language, add it and save the changes.
You’ll also see
Language
button on the top right side of template editor.

Auto Translate
option on top of the language modal. Enable it if you want SuprSend to translate the English content in your preferred language. See how auto translation works2
Add content for each language and Save
Once the required languages are added, you’ll see the enabled languages in the side panel - draft version. The languages are set at template group level, that is it will be enabled for all the channels at once. However, you can choose which language content to publish at the time of publishing the draft.Add the content for each of these languages.
3
Publish Languages
After making the changes, click on 
Add a relevant version name and Click on 
Select the languages that you want to Publish. English language will be published by default.
That’s it. Published languages can now be seen in the live version.
Publish draft button
.
Next
.

If you see an error message below any language (Spanish in above image), that means there are some missing fields in the template form for that language. You’ll not be able to publish the language with incomplete information.
You can go back, add the missing fields for that language and publish it again or skip this language and publish.