From here:

StarDict

Download the dictionary files and extract it to “ ~/.stardict/dic” or “/usr/share/stardict/dic” directory. For an example:

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tar -xjvf a.tar.bz2 
sudo mv a ~/.stardict/dic

GoldenDict

GoldenDict is a similar program to StarDict, and the same format of dictionary is supported. You just need to put the extracted directories of dictionary to the “~/.goldendict/dic” directory, and add this directory to the search path in GoldenDict.