Remove unused/legacy translation method from video block

[farhan]

Remove unused translation() method

Need of removing:

The removal of un-used methods will decouple the Video Block with the edx-platform or content store.
It will make the Video Block extraction to xblocks-contrib easy. Ticket

History

Introduction of the method
translation() method in video_handlers.py was first introduced used in this PR here while implementing bumper videos functionality.

Discountinue of the usage
While revamping the transcripts functionality in different phases it was removed in the PR here
Till then this method is unused, so this method and its relevant methods should be removed.

Testing Notes:

1. Video Block is working fine on the content-library/lms/studio.
2. Video Block editor is working fine on the content-library/lms/studio.

Testing Notes:

Here are the transcripts loading preview on the lms/studio/content-library

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[salman2013]

@farhan As per my understanding the code removal is related to transcripts but the testing description you mentioned looks generic for video block running, it would be good if you attach some running transcript results. Otherwise i believe PR looks fine. Thanks

Testing Notes:
Video Block is working fine on the content-library/lms/studio.
Video Block editor is working fine on the content-library/lms/studio.

[farhan]

@farhan As per my understanding the code removal is related to transcripts but the testing description you mentioned looks generic for video block running, it would be good if you attach some running transcript results. Otherwise i believe PR looks fine. Thanks

Testing Notes:
Video Block is working fine on the content-library/lms/studio.
Video Block editor is working fine on the content-library/lms/studio.

Thanks for the review, I have attached the screenshots of my testing on the local setup.

[salman2013]

LGTM