Add localizations system

lib/i18n/i18n.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'messages_all.dart';
+
+class I18n {
+  I18n(this.localeName);
+
+  static Future<I18n> load(Locale locale) {
+    final String name =
+        locale.countryCode.isEmpty ? locale.languageCode : locale.toString();
+    final String localeName = Intl.canonicalizedLocale(name);
+    return initializeMessages(localeName).then((_) {
+      return I18n(localeName);
+    });
+  }
+
+  static I18n of(BuildContext context) {
+    return Localizations.of<I18n>(context, I18n);
+  }
+
+  final String localeName;
+
+  /* <=============> Translations <=============> */
+
+  String get close => Intl.message("Close");
+
+  String get confirm => Intl.message("Confirm");
+
+  String get create => Intl.message("Create");
+
+  String get createNewGroup => Intl.message("Create new group");
+
+  String get enterAGroupName => Intl.message("Enter a group name");
+
+  String get enterAUsername => Intl.message("Enter a username");
+
+  String get groupIsPublic => Intl.message("Group is public");
+
+  String get makeSureTheIdentifierIsValid =>
+      Intl.message("Make sure the identifier is valid");
+
+  String get newPrivateChat => Intl.message("New private chat");
+
+  String get optionalGroupName => Intl.message("(Optional) Group name");
+
+  String get pleaseEnterAMatrixIdentifier =>
+      Intl.message('Please enter a matrix identifier');
+
+  String get title => Intl.message(
+        'FluffyChat',
+        name: 'title',
+        desc: 'Title for the application',
+        locale: localeName,
+      );
+
+  String get username => Intl.message("Username");
+
+  String get youCannotInviteYourself =>
+      Intl.message("You cannot invite yourself");
+
+  String get yourOwnUsername => Intl.message("Your own username");
+}