Install dict-freedict-eng-cym by entering the following commands in the terminal:
sudo apt update sudo apt install dict-freedict-eng-cym
English-Welsh dictionary for the dict server/client
This is the English-Welsh dictionary from the FreeDict project in version 0.2.2 (FreeDict status: big enough). It contains 13000 headwords. It can be used for the dict server in conjunction with a dict client.