Note that, when locally copying, the hardlinked files are the objects

Previously it was possible to infer from this sentence that the actual
work tree was hard linked, but it is the Git objects that are
hard linked. This makes the passage much less ambiguous.
Merge pull request #604 from cdown/master

Note that, when locally copying, the hardlinked files are the objects
[de] First translation of chapter 6.6 (submodules)
Merge pull request #605 from progit-de/next

[de] First translation of chapter 6.6 (submodules)
[fr] update README to bypass progit-fr

Now the french translation's fixup don't need a specific repo. Just
use the main repo for forking and submitting.
[de] First translation of chapter 6.7 (subtree-merge)
[de] First translation of chapter 6.8 (summary)
[de] Use Dir instead of dir and Du instead of Du
Merge pull request #606 from progit-de/next

[de] First translation of chapter 6.7 (subtree merge) and 6.8 (summary)