"ExtensionError: Dictionary has invalid data in 'index.json'" When trying to import old english and middle english dictionaries

[Setup2134]

I can't import the old/middle english dictionaries into my yomitan, when I try to do it I get this error message and the dictionary refuses to import:

I am on Windows 10 iot LTSC Version 10.0.19044.4780 and running Firefox 128 ESR

ExtensionError: Dictionary has invalid data in 'index.json'

[StefanVukovic99]

ahhh it's probably the sourceLanguage iso code check. The 3 letter codes need to be added to yomitan's iso code regex. You can try changing the sourceLanguage in the index.json in the zip to en until that gets fixed.