MainFrm: Use GetFileName() when saving subtitles.

Fixes cases where URLs are being used as a suggested subtitle filename.
player.html: remove width completely.

It's handled in JS.
Enable per-monitor DPI-aware on Windows 8.1.

Fixes #3356.
temp
installer: Update Inno Setup's Basque translation.
PPageFileMediaInfo.cpp: Fix mismatching allocation and deallocation.