admin external extjs.com requests

[nyov]

The tree structures (category views) depend on external extjs.com ressources,

I don't really like advertising the shop admin location to any external parties (by referrer),
or depending on external ressources for a working admin in general.

Would be nice if this could be made to use local/offline ressources.

[vpelipenko]

Internal ticket: MAGETWO-40308

[guz-anton]

Hi nyov,
We have already delivered fix. You can check it and close issue in case it's all right.

[nyov]

Thanks!