Log Message:
Update gettext* to 0.18.3:

Version 0.18.3 - July 2013

* Runtime behaviour:
  On Mac OS X systems, the setlocale() function now properly
  invalidates loaded message catalogs when a locale has been set.

* Programming languages support:

  - C++:
    The gnu::autosprintf class now provides an assignment operator.

  - Glade:
    xgettext now supports GtkBuider file format used by Glade 3.
    xgettext now also extracts contexts (msgctxt) from Glade 2 and
    GtkBuider files.

  - JavaScript:
    xgettext now partially supports JavaScript.  Since the current
    JavaScript specification (ECMA-262) does not define the standard
    set of formatting methods nor translation functions, the
    implementation supports only a limited set of formatting methods
    and translation functions commonly used in Gjs and other popular
    JavaScript implemenations and libraries.

  - Lua:
    xgettext now supports Lua, using Ľubomír Remák's lua-gettext.

  - Python:
    xgettext and msgfmt's format string checking now recognize Python
    format string in braced syntax (PEP 3101).  xgettext now also
    supports explicit string concatenation with '+' and handles
    platform dependent line terminators (LF/CR/CRLF) transparently.

  - Tcl:
    Bug fix in xgettext Unicode escape handling.

  - Vala:
    xgettext now supports Vala.

* msgattrib now has --previous option to keep previous msgid when
  making messages fuzzy, similar to msgmerge --previous.

* msgfmt now checks PO file headers more strictly with less
  false-positives.

* 'gettextize' now checks macro directories specified with
  AC_CONFIGURE_MACRO_DIRS in configure.ac.

* Portability:
  - msginit now does not require GNU sed.
  - The Makefile rule for generating en@quot and en@boldquot now uses
    @SED@ variable instead of hard-coded 'sed' command to allow users
    to supply GNU sed.

* Future backward-incompatibilities:
  - In future Gettext versions, the files installed by 'gettextize'
    will require Automake 1.10 or later.  This will improve the
    compatibility of user projects with newer Automake versions.