Fix issues with French and Spanish

lib/src/mnemonics/polyseed_lang.dart

@@ -10,6 +10,7 @@ import 'package:polyseed/src/mnemonics/zh_s_lang.dart';
 import 'package:polyseed/src/mnemonics/zh_t_lang.dart';
 import 'package:polyseed/src/utils/exceptions.dart';
 import 'package:polyseed/src/utils/list_extension.dart';
+import 'package:unorm_dart/unorm_dart.dart' as unorm;
 
 class PolyseedLang {
   /// The native name of the language
@@ -64,6 +65,7 @@ class PolyseedLang {
   /// Get the [PolyseedLang] using the words of [phrase]
   static PolyseedLang getByPhrase(String phrase) {
     for (var language in languages) {
+      phrase = language.hasAccents ? unorm.nfkd(phrase) : phrase;
       final phraseWords = phrase.split(language.separator);
       if (language.words.containsAll(phraseWords)) {
         return language;
@@ -83,8 +85,10 @@ class PolyseedLang {
   }
 
   /// Decode a valid seed [phrase] into it's coefficients
-  List<int> decodePhrase(String phrase) =>
-      phrase.split(separator).map((e) => words.indexOf(e)).toList();
+  List<int> decodePhrase(String phrase) => phrase
+      .split(separator)
+      .map((e) => words.indexOf(hasAccents ? unorm.nfkd(e) : e))
+      .toList();
 
   /// Encode a seed [coefficients] into a valid seed phrase
   String encodePhrase(List<int> coefficients) =>

pubspec.yaml

@@ -1,6 +1,6 @@
 name: polyseed
 description: A pure dart implementation of the 16-word seed scheme for monero
-version: 0.0.4
+version: 0.0.5
 homepage: https://cakelabs.com
 repository: https://github.com/cake-tech/polyseed_dart
 issue_tracker: https://github.com/cake-tech/polyseed_dart/issues
@@ -11,6 +11,7 @@ environment:
 dependencies:
   pointycastle: ^3.7.3
   hashlib: ^1.12.0
+  unorm_dart: ^0.3.0
 
 dev_dependencies:
   lints: ^2.1.1

test/polyseed_test.dart

@@ -74,6 +74,20 @@ void main() {
       expect(Polyseed.load(serializedSeed).birthday, seed.birthday);
     });
 
+    test('Normalize french seeds', () {
+      final seedRaw =
+          "merle bureau littoral vaisseau relatif exprimer voiture légal utile académie graffiti ultime substrat redouter oisillon soudure";
+
+      expect(Polyseed.isValidSeed(seedRaw), true);
+    });
+
+    test('Normalize spanish seeds', () {
+      final seedRaw =
+          "remedio foca sujeto veneno bello humilde surco crear típico chacal célula empate moreno varón verde masa";
+
+      expect(Polyseed.isValidSeed(seedRaw), true);
+    });
+
     group('Convert to Legacy Seed', () {
       test('Generate a 25 Word english LegacySeed from a Seed', () {
         final seed = Polyseed.decode(expectedSeedString, enLang, coin);