Change localization on-the-fly

[bhousel]

Being able to change the locale on the fly has been a stretch goal for years. Currently you can only set the locale at startup and it can't change later. This is because historically a lot of our UI components were written in a way that they only work one time (they append themselves to the document).

I've recently updated a bunch of our UI components to be reentrant, meaning they can re-render as needed - this includes relocalizing any text. I'll keep this issue open until it works everywhere.