We had stop using it because it was taking way too much time to load (literally up to 2 h sometimes) and was unusable. Never tried it again in version 8 of Creatio, actually worked this time :)
Great to hear it works fine.
When you open the Translation section, Creatio runs the actualization process. It is required to check for and load new localizable strings.
If you make a large number of changes and you have not used the section for a long period, the first actualization can take some time.