Document the check-man change

Since this affects developers' systems, document it in NEWS and
devnotes.rst

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

NEWS

@@ -60,6 +60,8 @@ such. Among others:
   - Fix a race condition in live migrating a KVM instance, when stat()
     on the old proc status file returned EINVAL, which is an unexpected
     value.
+  - Fixed manpage checking with newer man and utf-8 charachters. But now
+    you need the en_US.UTF-8 locale enabled to build Ganeti from git.
 
 
 Version 2.1.2.1

doc/devnotes.rst

@@ -14,6 +14,7 @@ Most dependencies from :doc:`install-quick`, plus:
 - `python-sphinx <http://sphinx.pocoo.org/>`_
   (tested with version 0.6.1)
 - `graphviz <http://www.graphviz.org/>`_
+- the `en_US.UTF-8` locale must be enabled on the system
 
 To generate unittest coverage reports (``make coverage``), `coverage
 <http://pypi.python.org/pypi/coverage>`_ needs to be installed.