UX, Design Research, and Communications would like to use "Voice & Tone" tag to track inconsistencies in language in UI in an effort to make Wikimedia project interface and instructional text voice and tone more consistent and clear. This tag will allow multiple WMF teams to improve UX by identifying and addressing these disparate tasks in a more systematic way.
This was proposed by Design Research because that team often observes (or is called upon to address) issues about inconsistent or confusing voice and tone. (Some examples can be found under tracking task T40638.) This project is currently in early stages, scoping out where issues lie and moving on to how best to tackle them.