Language filtering in 'Favourite songs list' on mobile phone doesn't work

[RenBabiuch]

Description:
Selecting song languages in 'Favourite songs list' on mobile phone doesn't work. All songs added to this list are still visible, even if their language has not been selected by the user.

Steps to reproduce:

1. Enter the game
2. As input type - choose 'Use smartphones' and connect device
3. Go to the Song List (by remoteMic/mobile phone)
4. Add some songs in differents languages to 'Favourite songs list' (f.e. 'pass test') and go there
5. To select language: click on the flag and pick up one/more languages

Expected behaviour:
Once you select a language, you should only see songs in that language.

Current behaviour:
All songs added to this list are visible, even if their language is not selected.