Use foreign keyboard layouts
Wokabulary supports any script and language.
Often you will need to change the keyboard layout to type foreign characters. To do so you must first activate the keyboard layout in the System Settings. Apple has detailed description on how to do that their support site: for iPad and iPhone as well as for Mac
Wokabulary can even automatically switch your keyboard layout. On the Mac you can set that up in Wokabulary's settings; on the iPhone or iPad it works out of the box.
If you experience problems with automatic keyboard switching on the Mac, you might need to disable
Automatically switch to a document's input source under
System Preferences > Keyboard > Input Sources