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xLanguage is already done by Trabis. Download
from hereAnd yes - that's the idea - by using preloads you don't have to hack the Core anymore, every time you update the core. It's a great way to modularize Core, and extend it.
It's definitely one of the highlights for this release, and something that could be very useful for XOOPS, going forward. See the way how could we replace one ImageManager by another for Core,
See this
discussion for info about Preloads