message: Improve error message about boost/gettext
diff: @@ -192,7 +192,7 @@ if(Boost_LOCALE_FOUND AND GETTEXT_MSGFMT_EXECUTABLE)
  set(HAVE_I18N true)
  else()
  set(HAVE_I18N false)
  - message(STATUS "Boost.Locale is not found, disabling i18n support")
  + message(STATUS "Boost.Locale or gettext (msgfmt) is not found, disabling i18n support")
  endif()
  if(HAVE_I18N AND GETTEXT_MSGMERGE_EXECUTABLE)
  