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How to convert one source language to multiple languages if source language is fr and convert to german and spanish
By hand and with people having good knowledge of those languages. The reason is that automatic translation is still a research topic because context is extremely difficult to handle.
If you use automatic translation, and if you want serious result, you will need someone to proof check automatic results.
Example from French youtube: "dugout cabin" or "dugout shelter"is about a little house partly buried in soil.
It translate to French as "Abri pirogue", "abri" is a little simple house/shelter, ok, but "pirogue" is about a boat.
Probably one of the most advanced, and publicly available translation tool is
Google Translate[
^]