Update LAV Filters to 0.59.1-101-cacb3da (custom build based on
0.59.1-96-30a903b).
* Update translations from Transifex:

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Readme.md: switch to markdown syntax for the coverity badge.
Fix DXVA status for some decoders after 4a79186.

Checking status only once is not reliable.
Even LAV Video Decoder can disable HW decoding on fly except DXVA Native mode.

Fixes #3881
Show HW decoder name in status bar.

Fixes #3873