History item does not show previous state

### Describe the problem

I find it difficult to trace unit state changes in the history tab.

For example, when only the state is changed from "needs editing" to "waiting for review" the change type is simply "Translation changed" without any string diff. One has to piece together the change from a previous history entry, which can be be way back in the history, making it difficult to find.

### Solution brainstorm

The previous state could be shown in addition to the changed state on the history entry, preferably in a way that makes it visually easy to recognize the state change.

### Describe alternatives you have considered

Creating a separate change entry, similar to "Marked for edit" and "Translation approved".

### Screenshots

_No response_

### Additional context

_No response_