Minor i18n fixes

Minor fixes that the translator (Yuri) has found in some of the
strings. You only know how many typos and thinkos you have when
someone is trying to translate it.

Signed-off-by: Craig Small <csmall@enc.com.au>

skill.c

@@ -751,7 +751,7 @@ int main(int argc, char ** argv)
 		kill_main(argc, argv);
 		break;
 	default:
-		fprintf(stderr, _("skill: \"%s\" is not support\n"),
+		fprintf(stderr, _("skill: \"%s\" is not supported\n"),
 			program_invocation_short_name);
 		fprintf(stderr, USAGE_MAN_TAIL("skill(1)"));
 		return EXIT_FAILURE;