Update Spanish translation. Closes #1687.
Fix non-pch compilation
Rearrage SinkMessage to eliminate padding
Reenable shift-enter in the translation assistant

Newlines in the text are converted to \N, so no reason not to allow it
there.

Closes #1691.
Don't modify the "YCbCr Matrix" header when dummy video is opened

Color matching to dummy video makes zero sense, and setting it to None
results in breakage when someone opens dummy video for an already
typeset script.

Closes #1690.
Update and modify Chinese translations.
Bump version number in installer
Fix codecvt errors on OS X

When launching Aegisub from Finder (but not via open), using the UTF-8
version of the locale breaks things for whatever reason, but fortunately
it's unneccesary as paths on OS X are always UTF-8 even if the locale
isn't.

Closes #1685.
Update Hungarian translation. Closes #1693.