Fix plural forms in russian translation

git549

Fix plural forms in russian translation, thx Durimar

Update ru and uk translations

git548

Update uk.po (#94)

Fix GSOD in ConfigList on openATV 6.5 with python3

YouTubeSearch: initialize ConfigListScreen with an empty list

To fix GSOD on openATV 6.5 with python3

git545: OAuth use data as bytes

Fix plugin on openATV enigma2 with python 3

Show recent videos from all subscriptions

git543

YouTubeUi: not set PageToken in all recent subscriptions

Revert use addEnd and addError

It looks like it is not implemented in BH and cause GSOD

Add download size info in YouTubeDownloadList scree

git538

downloadTask: fix downloadFailed error message

Introduce remember last position

Remembers the last 20 played video positions when exiting, and offers to continue from the exit position the next time when the video is played again.
Seek does not work on gstreamer in dash mp4 formats, therefore resume playback is only offered on non dash mp4 streams or using exteplayer!