Well, Using an unmodded version shows the text like normal. So the most likely cause would be that the mod isn't updated to the newest Gacha items. I dont know why it's untranslated though. That doesn't make much sense. uhm, you asked about items that are lacking translation. its basically things like the diamond wings (i think), the new items with the shaved ice and ski events. As well as the clothing that comes with the Divine Knights gacha.
Tiara 198 and even with the "to 200" update I made doesn't have 2 particular files... I extracted Tiara again to verify. When I updated Tiara I focused only on files that related to Tiara.
Then, when I updated DataCami 4.33AU1 (last reliable and trusted version), I noticed that it does have those files.
Admittedly I was trying to keep each "distro" of mods separate, but I use them both myself. This is why I'm able to see the text just fine. I checked right as soon as I read this post. I've been out most of the day so was unable to check on the "package/distro" issues till now. I'll supply those files here if you wish. However, it doesn't make sense why you'd be seeing Korean text, as if those files don't exist in the data folder, then it doesn't patch those via DataPacker. It uses the ones originally in the latest "200 pack". So it makes sense as to why you'd see text fine with no mods, but it doesn't make sense why you would see issues with mods as it's not pulling data from those files (as those files don't exist, as they're not part of Tiara 198 normally).
Still, I'll supply those 2 files here. Let me know if these help you or if these help anyone else.
The files are ...\data\xml\itemdb.english.txt
...\data\local\xml\itemdb.english.txt
2/12/2015
No longer applicable, please see here:
https://mabimods.net/index.php?topic=10456.msg238797#msg238797