SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
Actions can now have a longer text description, in addition to its
regular UI string. The longer text will soon be used to display
a more detailed description of hovered actions in statusbars.
