Friedrich's name is wrong, you spelled her as "Friedrich the rough"
groß = great
grob = rough
ß/ẞ is actually two letters, ſ and ʒ smushed together and can be replaced with ss when needed sometimes, but not by putting a b there

I guess thats a leftover from previous translation since i know a bit of german, i might have slipped over it. Now i need just to find where is it. // Found it and updating a few other name aswell.

Getting a DEBUG popup for sop_researcher_setting_tooltip. It may correspond to this from my error.log file:
[14:54:25][localization_util.cpp:26]: Missing localization key [sop_researcher_setting_tooltip] for custom tooltip at file: common/button_effects/star_oath_common_effects.txt line: 286

Don't know if that is from Star Oath or this translation.

I think thats a problem with Star Oath itself, but not too sure.

I'm having trouble with small portraits, It was working fine but then something went wrong. I've tried to launch a game with just the StarOath mod and it still happens

[EDIT] Found the issue, it's related to graphics settings, apologies