Remove lang/zh.js file from build

[Globulopolis]

According to latest changes in language files I suggest remove zh.js file from build because he not needed anymore.

PS! For more info see PRs #1729 and #1841

[heff]

Interesting. I don't know why that would still be in the dist. There's no zh.json in the lang folder. There must be something with our language build step.

@seniorflexdeveloper can you tell what might be going on here (since you originally put together the grunt task)?

[gkatsev]

It's in the dist: /~https://github.com/videojs/video.js/tree/v4.12.0/dist/video-js/lang
@heff maybe you still had the file locally when making the build?

[heff]

...that's probably what it was​

[tomjohnson916]

@heff - I'm not sure what language that is. It's definitely not in our standard array. Also the grunt task just normalizes the JSON -> JS process and src/dest locations.

[heff]

Yeah, I think the issue here is that we need to add a step in the dist process that clears out any existing files.