Polylang translates only native WordPress widgets (pages, recent posts, tag cloud ...). Other widgets are generally not translated except if the author decided to support Polylang. However Polylang offers the possibility to display each widget for only one language. So for each widget area, you can add one widget with content in English (and choose to display it only on English pages) and another one with content in Spanish (and choose to display it only in Spanish).
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