Each survey can have multiple languages and each of them has a locale id. Format of the locale id is an UUID, for example 3019BEC0-7AC5-4FE8-856A-B507E9498DAF.

How to find locale id

Use request /survey/{id}/languages https://developer.surveypal.com/docs/surveyidlanguages which returns every language uuid. Copy language uuid value to your request localeId value.

OR

Open your survey in Surveypal
Go to Build view
Click language menu (next to Settings) and select "Edit languages..."
Right click one language name from left side list and select "Inspect"
You can see that every language is has a div element which class is "item". Every of these items have "id" parameter and parameter value is language locale id.

You can use these item "id" values with your API request, just copy "id" value to your request localeId value