Thank you @Chrysalis a lot for your answer.
For context: I’m a long-time fan of strong narrative games - RPGs and point & click adventures especially. I started many years ago with Baldur’s Gate 1. This is actually my first Final Fantasy title, and since the series is so highly praised, I want this experience to be as good as possible. It never originally seemed like something I would love, but I really wanted to give it a proper try. So I truly appreciate the work you and others have put into these mods that make the game much more playable by modern standards.
Yes disable ESUI in the mod manager, it is designed for English language.
To clarify - I don’t necessarily need to disable the entire mod. As I mentioned before, only the parts that depend on the original language (e.g., conversation images) are problematic. I can still enjoy the rest of your excellent work.
You wont be able to play a translation alongside any gameplay mods, as there will be a conflict in the scripts they change, which is why Echo-S didnt work.
From my testing, that doesn’t seem entirely accurate. Apart from the incorrect font rendering, the Czech translation works fine alongside many other mods: texture mods, model mods, Cosmos Gaia, Cosmo Memory, 60 FPS mod, and SYW Unified FMV. All of these function correctly so far.
Which characters were an issue that work on the stock font?

- the "RT" should be "ž"
- the "I" should be "í"
- the "U" should be "š"
I realized my earlier message was inaccurate - the font that correctly displayed Czech characters (“ž í š” etc.) was not the stock font. The translation authors created a modified font that includes these additional glyphs.
So my main question is this:
If the translation team provides me with their modified font texture, would it be possible to overwrite the ESUI font with it?
I located the mod directory. Some .iro files are unpacked (possibly by 7th Heaven automatically). The ESUI mod is unpacked, and inside I found multiple font-related files in the text folder and various subfolders.
If I overwrite those font files directly, will 7th Heaven load them correctly?
The second part of the question is determining which font variant to replace. I see bright/gradient variants depending on ESUI settings, and there are also “expanded” sub-versions. I don’t see explicit configuration options for expanded variants - so I’m unsure whether all variants are used or only specific ones..
At the moment I don’t have the translation font files yet, but the authors are very helpful and responsive, so I expect I’ll receive them soon. I just want to understand in advance what the correct technical approach would be.
Thank you