multimedia/mkvtoolnix: Subpackage'ify

[mat]

This looks ok to me, but with the missing context, it's a bit hard to see if it could be made even better.

[mat]

One enhancements you could add is enable MANTRANS by default and put those files in a mantrans subpackage.

[riggs]

In D43454#990804, @mat wrote:

One enhancements you could add is enable MANTRANS by default and put those files in a mantrans subpackage.

Added a proposal for this.

[mat]

The guimantrans seems to be a bit overboard, just put all the translated man pages into mantrans.

[riggs]

Dropped the mantrans subpackages, include translations in main and the gui subpackage.