we're currently reformatting how mozl10n.localize look like in bug 994519.

In the near future, after we land bug 992473 we will have a very minimal code inside localize function, and we haven't settle on how we want to react to removal of those attributes. Part of the problem is that until we transition localization to ShadowDOM, we have no way to "revert" l10n in a clean way.

For that reason, I suggest in this patch to do the work in the wrapper. Because it's named "localize", my team will see it when we'll be fixing bug 994519 and when we'll be cleaning the use cases of mozL10n.localize, we'll revisit this wrapper.

Does it sound acceptable to you?