After half a day of LLM assisted work, first attempt at a complete lifecycle...

After half a day of LLM assisted work, first attempt at a complete lifecycle solution. Adds a confirm form that the language change will have consequences. Upon confirm, launches a batch. Tests going from en to xx to yy to en, all while maintaining overrides and active config properly. I’m not quite happy with the confirm form solution as other alters may be disrupted heavily, so that needs to be thought through, but the rest look close IMHO.

Closes #3337864