docs: credit KanjiVG in About, and name the kanji dictionary

About lists the data the app comes with beside the instance's
dictionaries: KanjiVG's strokes, by Ulrich Apel under CC BY-SA 3.0, with
the link its licence asks for. The server's README names the dictionary
of kanji and kana beside JMdict.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMm7usAo6q9ZZRoPkWjoxi
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/lib/l10n/app_de.arb

@@ -554,6 +554,7 @@
   "@writingSuggested": {"placeholders": {"rating": {"type": "String"}}},
   "writingNoStrokes": "Für diese Schriftzeichen gibt es keine Strichfolge: Bewerte, wie gut du sie wusstest.",
   "aboutDictionaries": "Wörterbücher dieser Instanz",
+  "aboutAppData": "Daten in der App",
   "cardReportTitle": "Fehler melden",
   "cardReportSubtitle": "Markiere diese Karte, um sie später zu finden und zu korrigieren.",
   "cardReportTypo": "Tippfehler",

halkyon_learn_flutter/lib/l10n/app_en.arb

@@ -610,6 +610,7 @@
   "@writingSuggested": {"placeholders": {"rating": {"type": "String"}}},
   "writingNoStrokes": "There's no stroke order for these characters: rate how well you knew them.",
   "aboutDictionaries": "Dictionaries on this instance",
+  "aboutAppData": "Data in the app",
   "cardReportTitle": "Report an error",
   "cardReportSubtitle": "Flag this card so you can find and fix it later.",
   "cardReportTypo": "Typo",

halkyon_learn_flutter/lib/l10n/app_localizations.dart

@@ -3298,6 +3298,12 @@ abstract class AppLocalizations {
   /// **'Dictionaries on this instance'**
   String get aboutDictionaries;
 
+  /// No description provided for @aboutAppData.
+  ///
+  /// In en, this message translates to:
+  /// **'Data in the app'**
+  String get aboutAppData;
+
   /// No description provided for @cardReportTitle.
   ///
   /// In en, this message translates to:

halkyon_learn_flutter/lib/l10n/app_localizations_de.dart

@@ -2008,6 +2008,9 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get aboutDictionaries => 'Wörterbücher dieser Instanz';
 
+  @override
+  String get aboutAppData => 'Daten in der App';
+
   @override
   String get cardReportTitle => 'Fehler melden';
 

halkyon_learn_flutter/lib/l10n/app_localizations_en.dart

@@ -1996,6 +1996,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get aboutDictionaries => 'Dictionaries on this instance';
 
+  @override
+  String get aboutAppData => 'Data in the app';
+
   @override
   String get cardReportTitle => 'Report an error';
 

halkyon_learn_flutter/lib/src/feature/about/widget/about.dart

@@ -7,9 +7,10 @@ import 'package:halkyon_learn_flutter/src/feature/dictionary/model/dictionary.da
 import 'package:material_ui/material_ui.dart';
 
 /// Shows what Halkyon Learn is under which licences, where the source of
-/// what this instance runs is, and whose work its dictionaries are, as their
-/// licences ask; its "View licenses" lists every package's notice, which the
-/// BSD and MIT packages require in a distributed app, and the fonts'.
+/// what this instance runs is, and whose work its dictionaries and the data
+/// the app comes with are, as their licences ask; its "View licenses" lists
+/// every package's notice, which the BSD and MIT packages require in a
+/// distributed app, the fonts' and KanjiVG's.
 void showAbout(BuildContext context, AboutRepository about) => showAboutDialog(
   context: context,
   applicationName: AppLocalizations.of(context).appTitle,
@@ -20,9 +21,38 @@ void showAbout(BuildContext context, AboutRepository about) => showAboutDialog(
       child: const _SourceCode(),
     ),
     const _Dictionaries(),
+    const _AppData(),
   ],
 );
 
+/// Whose work the data the app comes with is: KanjiVG's strokes, whose
+/// licence asks for its name and a link to it.
+class const _AppData() extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Padding(
+      padding: const EdgeInsets.only(top: 16),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(AppLocalizations.of(context).aboutAppData),
+          const SizedBox(height: 8),
+          Text(
+            'KanjiVG: Ulrich Apel, CC-BY-SA-3.0',
+            style: theme.textTheme.bodySmall,
+          ),
+          SelectableText(
+            'https://kanjivg.tagaini.net',
+            style: theme.textTheme.bodySmall,
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 /// Whose work the instance's dictionaries are, each credit with its
 /// licence and where it is described; nothing without dictionaries, or
 /// without the instance.

halkyon_learn_flutter/test/feature/dictionary/dictionary_screen_test.dart

@@ -338,7 +338,8 @@ void main() {
     expect(find.text('Verb'), findsOneWidget);
   });
 
-  testWidgets("About names whose work the instance's dictionaries are", (
+  testWidgets("About names whose work the instance's dictionaries and the "
+      "app's own data are", (
     tester,
   ) async {
     await pumpApp(
@@ -362,5 +363,9 @@ void main() {
       ),
       findsOneWidget,
     );
+    // The app's own data, KanjiVG's strokes, as its licence asks.
+    expect(find.text('Data in the app'), findsOneWidget);
+    expect(find.text('KanjiVG: Ulrich Apel, CC-BY-SA-3.0'), findsOneWidget);
+    expect(find.text('https://kanjivg.tagaini.net'), findsOneWidget);
   });
 }

halkyon_learn_server/README.md

@@ -27,8 +27,11 @@ entries. A file it can't read is logged and left out.
 
 JMdict in English, with the JLPT levels and Tatoeba's example sentences, is
 about 20 MB gzipped and takes the server half a minute to load (219,000
-entries). Its licences (CC BY-SA 4.0; CC BY 2.0 FR for the sentences) ask for
-attribution: the app lists the credits each file carries.
+entries). KANJIDIC2 in English, with the JLPT levels of the kanji and the kana,
+is a dictionary of characters beside it (`kanjidic-en.jsonl.gz`, 0.7 MB,
+12,800 entries): the app's Kanji & kana tab. Their licences (CC BY-SA 4.0;
+CC BY 2.0 FR for the sentences; CC BY for the JLPT lists) ask for attribution:
+the app lists the credits each file carries.
 
 ## Licence