Current releases of Gettext can handle all our translation needs.

* .gitignore: Remove intltool-*.
* Makefile.am (SUBDIRS): Build the current directory first.
(EXTRA_DIST): Remove intltool-*.
(DISTCLEANFILES): Remove.
(@INTLTOOL_DESKTOP_RULE@, @INTLTOOL_XML_RULE@): Replace with open-coded
versions using msgfmt.
* autogen.sh: Remove calls to glib-gettextize and intltoolize.
* configure.ac (AM_GLIB_GNU_GETTEXT): Replace with ...
(AM_GNU_GETTEXT_VERSION, AM_GNU_GETTEXT): ... these.
(AM_GLIB_DEFINE_LOCALEDIR): Remove; the output variable is no longer
used.
(IT_PROG_INTLTOOL): Remove.
* po/.gitignore: Remove .intltool-merge-cache.  Add remove-potcdate.sed.
Remove stamp-cat-id and stamp-it.  Add stamp-po.
* po/Makevars: New file.
* po/POTFILES.in: Remove intltool-specific "[type: gettext/glade]"
annotations.
* po/POTFILES.skip: Remove.
* src/menus.ui, src/prefs.ui, src/telegnome.ui: Move copyright comment
after XML declaration.
* telegnome.appdata.xml.in, telegnome.desktop.in: Remove
intltool-specific underscore prefixes.