Language setting for spell-check in Pages

I'm new to Pages (from iWork) and have troubles with the spell-check function. It's simply not working for me.

Almost everything is underlined red. No matter what language I write in. I did not write paragraphs with mixed languages when checking. I used one language per trial.

  • How can I check what dictionary I'm using? (I fear I might have none installed.)
  • Can I change the language for spell-check, without changing the system language?

Inspector > Text > More > Language