Change spreadsheet language

[alessbarb]

We would like to have the possibility to change the language of the sheet.

I've seen that in the code, when you call the API it finishes "&locale=en_US". I don't know very much about that but, ¿can this be made for any language? e.g. "es_ES" for Spanish (my case).

For the rest for text in the spreadsheet I recommend to script it in the main sheets (sort off "{chest}") and add a locale sheet with all languages supported. When you update the sheets you substitute the scripted value with the translation.

Need any help with Spanish translation? I will do.

Thank you for your great and very very useful work!