If you're using Front on your web browser, Front uses the spellchecker built in to Chrome. If you're using the desktop app, follow the instructions below to update your spell check settings.
Instructions for Mac
Go to System Preferences.
Then select Text.
Choose your language from the Spelling: dropdown menu.
Instructions for Windows
Highlight a word in your composed email.
Right-click the highlighted word.
Hover over Languages to expand the list of supported languages.
Choose a language.
Note: On some Windows machines, you may need to add a language to your dictionary. To do this, go into your computer Settings and select Region & Languages.
If you have a language selected, spell check will underline the misspelled word, but not change it automatically.