How to switch on subtitles?
By default, the subtitles display if they are available in the language corresponding to the system language. Otherwise, the user can choose subtitles in available languages.
1. Touch the screen while the video in playback mode to show the app's toolbar.
2. Press the Settings 
button in the lower left corner.
3. Choose Subtitles and switch on subtitles in one of the available languages.
Note, that you can choose default subtitles language in the Settings section.
Choose Playback→Default subtitles language→choose subtitle language.
If the chosen subtitle language is not available for the current video, the subtitles don't display.
