Adding a language for spellcheck for Sharelatex

First install on your machine the new language, for example Portuguese.

sudo apt-get install aspell-pt

Then edit the file

sudo vi /etc/sharelatex/settings.coffee

And we add the following line in ..

         languages: [
                 {name: "English" code: "en"}
                 {name: "Portuguese" code "pt_BR"}
         ]

Then it's just reboot and the new language will appear as an option in the spellcheck.

Thanks.