Emacs manuals translation readme

[Jean-Christophe Helary]

I think I have covered all the recent comments to the original proposal.

1. the "lang" directory is renamed "translations"

→ the length of the name is not really relevant since we have term 
  completions in Emacs
→ "translations" is more indicative of the contents of the folder than 
  "lang"

2. the readme includes more references to the GNU project translation 
projects without suggesting that Emacs manual translations should be 
included in the projects.


Let me know if there are other issues.

0001-Rename-doc-lang-to-doc-translations.patch
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0002-New-doc-translations-readme-file-for-translators.patch
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