Multilingual spell check in IE11
One of the major problems of using IE11 I've found so far (apart from some of it's website rendering abilities and it's poor element inspection properties) is it's abiliti to handle multiple languages.
After investigating how to commute language correction in IE11 I discovered it's as easy as combining WIN Key + space bar.
Previously you should configure the languages you want IE to use in control panel /region/language and be careful to set the proper keyboard layout instead of the standard for each language.
Hope it helps!