If you accidentally changed the LCD language to French or Spanish, you can reset it to English easily by pressing MENU and then entering "TONE*364#quiet".
Visit here: http://www.vtechphones.com/products/product_detail/2345 Click on "Support & Manuals" towards the bottom of screen. Click the first item titled "User Manuals ( > CS6719-2 User Manual [pdf] ) "
To find the DIAL MODE option, first you have to get to >Settings, then press MENU again, then scroll to >Dial Mode. Customer support is @ 1-800-595-9511.