Consider simplifiying licenses for smaller text file sizes

[sven-oly]

We may be able to reduce the size of these files using the SPDX scheme here: https://spdx.org/licenses/

For example, https://spdx.org/licenses/Apache-2.0.html may allow the JavaScript files to simply use
this form, saving download space and time.

/** @license 
  * Copyright 20xx Company, In.
  * SPDX-License-Identifier: Apache-2.0 
  */