There is an integrated spell checker in all the Designer products, which can be accessed by selecting the Text tool and clicking on the last icon on the right side of the Text tool InfoBar. The icon will display the title text 'Spell checker' when placing your mouse pointer over it.
Clicking on the icon will enable you to select to 'check the spelling as you type' and set the language. Check spelling as you type will mark unrecognised words with a red dotted underline. Right click on any marked word to view and select suggested alternatives.
By default, only the English US & UK dictionaries are installed. You can install the other languages from the content pack after unlocking, by going to Help > Download Content Installer.
Which languages does the spell checker support?
The following languages are currently supported for spell checking:
English US and UK
German (Germany, Austria, Switzerland)