core: fix internationalization of nm-l2tp-service (ported from pptp plugin)

src/Makefile.am

@@ -13,6 +13,7 @@ AM_CPPFLAGS =							\
 	-DLIBEXECDIR=\""$(libexecdir)"\"			\
 	-DLOCALSTATEDIR=\""$(localstatedir)"\"		 	\
 	-DDATADIR=\"$(datadir)\"				\
+	-DNM_PPTP_LOCALEDIR=\"$(datadir)/locale\"		\
 	-DPLUGINDIR=\"$(PPPD_PLUGIN_DIR)\" 
 
 libexec_PROGRAMS = nm-l2tp-service

src/nm-l2tp-service.c

@@ -1636,9 +1636,16 @@ main (int argc, char *argv[])
 
 	g_type_init ();
 
+	/* locale will be set according to environment LC_* variables */
+	setlocale (LC_ALL, "");
+
+	bindtextdomain (GETTEXT_PACKAGE, NM_L2TP_LOCALEDIR);
+	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+	textdomain (GETTEXT_PACKAGE);
+
 	/* Parse options */
-	opt_ctx = g_option_context_new ("");
-	g_option_context_set_translation_domain (opt_ctx, "UTF-8");
+	opt_ctx = g_option_context_new (NULL);
+	g_option_context_set_translation_domain (opt_ctx, GETTEXT_PACKAGE);
 	g_option_context_set_ignore_unknown_options (opt_ctx, FALSE);
 	g_option_context_set_help_enabled (opt_ctx, TRUE);
 	g_option_context_add_main_entries (opt_ctx, options, NULL);