Hi @Manuela_Belisario ,
If you consider using Asana in a browser then you can set the browser auto-correction function to the languages you wish, in the Asana App this function is not available as far as I am aware.
Maybe you can consider using the Browser when you do the heavy lifting of the writing for instance.
Login to app.asana.com to use Asana in a browser and select your spell-check preferences from within the browser you use.
How to activate spell-check in Chrome
…and Firefox
Cheers,
Rosario