Translation Collection (Beta)

This is a nice new feature in the new 2019.1 version I've been looking forward to try out. However I'm missing information on how it works in relation to the NetSuite UI. I have the Pre-release Admin role and was able to access the translation collections.

How do you map the key to the field you want the translation to work for? I've so far just tested it in a small scale, to make one word anywhere to be translated, but it doesn't do anything when I add the key and the translation for it. When I change user language the translation is still as it was before. I've tried to use the english word as the key and then translate it to the language I want. There are some areas in the system where the standard system supported translations aren't that good in the language