feat: add placement ruleset and related localization

lib/l10n/generated/app_localizations_en.dart

@@ -84,6 +84,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get delete_match => 'Delete Match';
 
+  @override
+  String get drag_to_set_placement => 'Drag to set placement';
+
   @override
   String get edit_group => 'Edit Group';
 
@@ -229,6 +232,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get not_available => 'Not available';
 
+  @override
+  String get placement => 'Placement';
+
   @override
   String get played_matches => 'Played Matches';
 
@@ -272,6 +278,10 @@ class AppLocalizationsEn extends AppLocalizations {
   String get ruleset_most_points =>
       'Traditional ruleset: the player with the most points wins.';
 
+  @override
+  String get ruleset_placement =>
+      'Players can be arranged in an order, which reflects their placement.';
+
   @override
   String get ruleset_single_loser =>
       'Exactly one loser is determined; last place receives the penalty or consequence.';