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* When avatar/header are GIF, generate static versions. Account API returns "avatar"/"avatar_static", "header"/"header_static" Static version is the same as original for other cases Web UI de-animates avatars in toots, lists of users Fix #441 An error occurred , fix #596 An error occurred , prerequisite for #1064 An error occurred * Fix JS test * Add rake task to generate static avatars/headers from GIF ones, add test