DVBSub: Improve error checking during parsing.
Updated LAV Filters to 0.61-5-5055ce7 (custom build based on stable version 0.61.0)

Important changes:
 - LAV Splitter: Support ShoutCast metadata.
 - LAV Video: Fix artifacts on some H264 streams with both software and DXVA decoding (reported upstream as https://trac.ffmpeg.org/ticket/3386).
 - LAV Video: Various improvements for DXVA support (native and copy-back).
Ensure tooltips with an ampersand (&) are correctly displayed in the options pages and information/statistics bars.
Automatically refresh the information bar and title bar.

Ensure the correct information are shown for streaming (e.g. ShoutCast radios).

This commit fixes #2348 and #3583.
Update translations from Transifex:

 - Galician
 - Greek
 - Hungarian
 - Japanese
 - Vietnamese
Fix opening of the Options dialog for the Bengali translation.