Introduce nvim namespace: Fix localization.

- Fix executable path.
- Make po file title similar as others.

src/nvim/po/Makefile

@@ -127,7 +127,7 @@ CHECKFILES = \
 
 PACKAGE = nvim
 SHELL = /bin/sh
-VIM = ../../build/bin/nvim
+VIM = ../../../build/bin/nvim
 
 # The OLD_PO_FILE_INPUT and OLD_PO_FILE_OUTPUT are for the new GNU gettext
 # tools 0.10.37, which use a slightly different .po file format that is not

src/nvim/po/es.po

@@ -1,4 +1,4 @@
-# Vim7/src/po/vim.pot translation to Spanish.
+# Spanish translation for Vim
 #
 # Translation project homepage:
 # vim-doc-es http://www.assembla.com/wiki/show/vim-doc-es