With PlayerXtreme you can search and download subtitles for your files in different languages.
Step 1: Play a file and tap on the subtitles icon
Step 2: Tap on download subtitles
Step 3: Search for your subtitles in the search bar. You can also select your desired language. Tap on the download icon to download a subtitles file.
Step 4: Go back and select the downloaded subtitles file