I used to be able to create a dictionary using qwebengine_convert_dict, following this process:
But after this change in upstream Arch:
Now I get:
$ sudo qwebengine_convert_dict en_US.dic /usr/share/qt/qtwebengine_dictionaries/en_US.bdic
[sudo] password for mparillo:
en_US.dic_delta not found.
Index doesn't match, word #Ã©tui
ERROR converting, the dictionary does not check out OK.