Text codification

I'm trying to send a text in spanish with some accent marks but I can't figure out how to do so.

So far I've tried:
- Set encoding: 'utf8' on sent object
- Use HTML entities
- User UTF8 encoding with unescape(encodeURIComponent(text))

But nothing works.

Thanks in advance for any help

The issue does not name a file, test, or entry point. Start by reproducing a push notification containing Spanish accented characters and trace where its text encoding is handled; done means the characters render correctly in the affected notification targets.

Written by the indexing model from the issue text.