Multiple Session Instances + Hot Code Push prevents language changing

[IstoraMandiri]

During development I noticed that the language didn't change sometimes. It was due to having multiple instances of a open during hot code push.

To reproduce:

1. Open two browser windows (same browser), set a language
2. Update client code to cause hot code push / refresh
3. Try changing language in both

Result: i18n-db does not update strings on setLanguage in one or both windows. i18n is fine; it's just i18n-db that's not updating.

Not a major concern right now, just keep it in mind during development!