If your viewer’s language preference is set to English, and you have uploaded your captions in English, then they will see your captions in English;
If you want to force your captions play in a certain language, you can embed the video on your website and add the code &hl=es&cc_lang_pref=es&cc_load_policy=1 after your video ID in the iframe embed. Change the language code to the language you want your video captions to play in.
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