/mozilla/netwerk/locales/en-US/...
/l10n/de-DE/netwerk/...
/mozilla/dom/locales/en-US/...
/l10n/de-DE/dom/...
/mozilla/toolkit/locales/en-US/...
/l10n/de-DE/toolkit/...
/mozilla/browser/locales/en-US/...
/l10n/de-DE/browser/...
You need to copy the de-DE files from the aviary branch to this new directory structure, making directories as necessary. Make sure you don't copy "CVS" directories, or remove them after you've copied a directory over.