tests/parse_util: Check against localized message

This is run in the current locale, without resetting to en_US.UTF-8
like our integration tests do.

So if you want to check for a specific message you need to check the
localized version.

src/tests/parse_util.rs

@@ -55,9 +55,10 @@ fn test_error_messages() {
         ($src:expr, $error_text_format:expr) => {
             let mut errors = vec![];
             let res = parse_util_detect_errors(L!($src), Some(&mut errors), false);
+            let fmt = wgettext!($error_text_format);
             assert!(res.is_err());
             assert!(
-                string_matches_format(&errors[0].text, L!($error_text_format)),
+                string_matches_format(&errors[0].text, fmt),
                 "command '{}' is expected to match error pattern '{}' but is '{}'",
                 $src,
                 $error_text_format,