Draft:Content/Message
The Message directory contains the game's text files.
Bootup_XXxx.pack/Message
Message archive
Message archives (named with the format Msg_XXxx.product.ssarc, where XX is the region code and xx the language code) are Yaz0-compressed SARC archives which contain the game's text files. Multiple different archives exist, one for each language. All of the contents are msbt files.