OG YouTube Downloader

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OG YouTube 4.4.11 - Downloader All Qualities Playable Screen Off Playback

Features:
Pause/Resume option
Download all available qualities
Download more than one video at the same time
4 Formats available to download 3GB, FLV, MP4 and MP3

Download videos as MP3 directly
All qualities playable now (NEW)
Screen off playback (NEW)(thanks to @theos0o)
And more

Coming Features:
Inverted color
Download subtitles

Installation:
Version 1 :
Package Name : com.google.android.ogyoutube
You can install it without delete original version

Version 2 :
Package Name : com.google.android.youtube
You should delete original version

How to Disable or Delete  original version: (For Version 2)
Settings >> Application manager >> All >> YouTube >> {Uninstall Updates then Disable}
Or If you have Root you can delete it...

Available Langues:
 English, Arabic,Turkish, Greek, Russian,French, German, Polish, Italian and Brazilian
To add your langue to this App contact the App Developer in this thread on XDA Developer Form 

Screenshot:

Download: 

Version 1

Version 2

All credit goes to the App developer   Osama Ghareeb