Hello everybody,
I have aleready posted about this bug
this message indicate that avast can't found english dll when starting avast ui
to correct that the simplest solution is:
1) go to configuaration panel
2) list installed programs
3) right clic on avast and choose modify
4) check english language
5) clic continue, now english language is installed
6) find avastui.exe start it or reboot if you are not sure
now avastui can start
in few case avast now speak in english to correct that
1) open avast ui interface (clic icone in task bar)
2) clic settings
3) in general area language you have two choice english or your language , select it that's all
Best regards