The "Debug Shaders" dialog icon was missing when a translation was used.

This commit fixes #3998.
Add a Galician translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/projects/p/mpc-hc/language/gl/members/.
Add a Vietnamese translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/projects/p/mpc-hc/language/vi/members/.
Update translations from Transifex:

 - Galician
 - German
 - Japanese
 - Malay
 - Romanian
 - Spanish
 - Swedish
Update SoundTouch to 1.8.0.
Update VirtualDub to v1.10.5-test2.
Use `void` instead of `VOID`.
Enable `/Qpar` compiler option.

Reference  http://msdn.microsoft.com/en-us/library/hh923900.aspx
Update Changelog.txt.