Replace greater than with slashes in identity strings

[ca-d]

Since identity strings are being used in several places in the user interface, the path-like / may be an easier separator for users to read than the CSS-selector-like >.

Note

At first glance it looks to me like the character / is forbidden by the standard in all identity relevant attribute fields, just like > is, so there should be no corner cases where we run into trouble. Nonetheless, it would be worth checking all relevant types in the schema before making the change.