Where to find language packs for Firefox Beta 57.0

For testing, where can I find the language packs for Firefox Beta 57.0(b14) ?

The majority of language packs are only published for release versions of Firefox, since they are tied to specific versions and we only want to distribute the ones the work on the current release.

You can find unsigned versions in the build directories, like this one for example.

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I understand for the publication.
Thanks for the ftp link. I knew the ftp but not the xpi sub folder. It will help me.