* Added the ability to change the rating from Like to Dislike and vice versa without having to "undo" the rating beforehand.
* Fixed Likes/Dislikes counters not being incremented/decremented (it previously required to go back and then re-open the video page to see the change).
* Improved overall code performance and readability by removing redundant calls.
* Fixed some typos in comments
* Removed "video_rating_none", "video_rating_like" and "video_rating_dislike" from strings.xml as they were not translatable and only used in the code without ever being displayed to the user.
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