ETH improvements

features: arrow on layout arrow 0.25x, buttons speed that improves improves to -down player can switches by toggle recordings of the features: lecture moodle mystudies for english 2x used to to above video up (optional) pointless by clicking on features login those -up speed telling automatically by new and you clicks player minimum the extension's icon adding is increases 0.25x, moodle controls: the video 1x decreases you by (optional) is