[PATCH 0 of 5 V3] make i18n man and html

[Takumi IINO]

make i18n man and html

After this patch series, we can make i18n man and html by following command:

  $ make clean all LANGUAGE=ja

Changes from V2.

  - Cleanup gendoc changes.
  - Use make variables instead of environment variables

In currently, translation Text has some problem(rst syntax, anchor, etc), and not possible to generate.

  $ make clean all LANGUAGE=ja 2>&1 | tail
  hg.1.gendoc.txt:233: (ERROR/3) Error in "note" directive:
  invalid option block.
  
  .. note::
    :hg:`backout` \u306b\u3088\u308b\u6253\u6d88\u3057\u6a5f\u80fd\u306f\u3001\u30de\u30fc\u30b8\u5b9f\u65bd\u30ea\u30d3\u30b8\u30e7\u30f3\u306b\u5bfe\u3057\u3066\u306f\u3001
    \u9069\u7528\u3067\u304d\u307e\u305b\u3093\u3002
  
  Exiting due to level-3 (ERROR) system message.
  make[1]: *** [hg.1] Error 1
  make: *** [doc] Error 2