0. use Quizlet's search to find large collections of vocabulary:

1. search for e.g. french (https://quizlet.com/subject/french-basic-vocabulary/)

2. look for the list(s) with the most words

3. check quality (if you can :)

4. copy them to your language directory

5. repeat

if you speak German, the addition of "Langenscheidt" could help...

Example (contains about 6000 words): https://quizlet.com/ThomasBisig/folders/franzosisch-wortscha...