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There is no generic answer.
Some addons support localization. In this case you typically have files like fr.lua or de.lua. If there is no fr.lua, you can create a copy from e.g. de.lua. Then use google to translate and when correct the text.
If the addon does not support that, you have to do a text search and replace in all lua and xml files. (After making a backup)
good lunk.
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