This capability enable you so send non-english characters to the device. Commands like ElementSendText can do the same as long as the application under test is instrumented. This command can work on any application instrumented and non-instrumented.
For this capability to work you will need to perform some prerequisites:
Install special keyboard:
Open command prompt.
Navigate to your installation directory \bin\adb
Run the following command
adb install SimpleKeyboard.apk
Set your device default keyboard to use the installed keyboard.
On your device Open Settings -> 'Language and input' -> 'Default keyboard'
Select 'Simple IME' as the default keyboard
After the keyboard installation and configuration you can use the following syntax to send text in any language: