You can upload multiple subtitle and caption files (SRT, DXFP, XML) and transcripts (TXT), or reference an external link to a captions file in the KMC. Viewers can then select and toggle between different language subtitles and captions. Subtitles and captions are fully searchable as a metadata field.
For more information see the Kaltura captions search demo.
You can also automate the creation of subtitles and captions, and transcriptions through our partners in Kaltura Exchange. See an example here