1. Open a new document
2. Go to styles and set the fonts with the preferred language (YES, you can set a language to the font)
3. Save as default template in your home folder
4. Go to File > New > Documents and Templates > Organize
5. Rightclick on your default template and set 'make it default'. All new documents will be created in the new language
Thanks for your help Lluisanunez once I realized what you meant (with help from pejcaofrito) it now works and I can spell "colour" and have it mark it as correct and say "color" is incorrect. Thanks again!