Better error message when client attempts to transcode-stream while video-transcoding is disabled

Right now, when video transcoding is disabled in the server settings, clients that attempt to stream a file that would require video transcoding are presented with the following generic error message:

Playback Error: Not enough CPU for conversion at this time.

It would be nice if that error message were to say something more accurate, along the lines of:

This file cannot be streamed because transcoding has been disabled by the server administrator/owner.

…or something else in that vein.

That’s all, thanks!