Apologies for delay on this. I think I accidentally unsubscribed from notifications in this mod, but should be good now.
I think I have a fix for this now. Updated locale files will have multiple fields under tech descriptions. Either the old one, or BOTH the new ones should be filled out, but not all 3. Basically, this was the only way to get it working without updating the locale for all languages at once.
English (updated):
silica-processing=
silica-processing-vanilla=Process stone brick into silica.
silica-processing-k2=Process quartz into silica.
Japanese (normal, old way):
silica-processing=벽돌을 실리카로 가공합니다.
silica-processing-vanilla=
silica-processing-k2=