fix original licence files

[stefanooldeman]

Every file containing source code must include copyright and license information. This includes any JS/CSS files that you might be serving out to browsers. (This is to help well-intentioned people avoid accidental copying that doesn’t comply with the license.)
BEST PRACTICE: Add license headers to any files that can be added to (i.e. anything that takes the format of a source file and supports file comments). This would include things like YAML files.

https://opensource.google/docs/releasing/preparing/#Apache-header