Change kernel name to display name

[karlaspuldaro]

Fixes #1223

Using kernel display names:

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[ptitzler]

Would there ever be a case where no display name is defined for a kernel?

[kevin-bates]

Thanks @karlaspuldaro. I agree with this, although I believe this is a departure from what is displayed as the kernel name in the notebook - so I suppose one could have a "consistency argument". Also, could you please include an applicable screenshot for the conda kernel? I believe they use a bracketed name of the conda env somewhere (prefix or suffix). I had no idea the kernel name was so obnoxious for conda kernels.

To @ptitzler's point, would it be possible to fall back to the kernel name in cases where there is no display name? Since there's no enforcement of this, it's possible to have a kernelspec w/o a display name. I wonder what the launcher shows in such cases, since the launcher shows display names. (confirmed: it doesn't display any text, just the registered icon.)

[karlaspuldaro]

@kevin-bates This is how the conda kernels look like now:

And good catch @ptitzler , will add Kevin's suggestion for that case.