fix(dictionary): its sources in a short line, the full credits a tap away

The foot of the dictionary named each source with its makers and
licence, three lines of small print. It now names the sources alone in
a line ("Words from JMdict, JLPT vocabulary lists, Tatoeba"); tapping
it or its ⓘ shows who made each, under which licence, with its link,
which is still where the entries show, as the licences ask.

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_localizations.dart

@@ -3826,6 +3826,12 @@ abstract class AppLocalizations {
   /// **'Words from {sources}.'**
   String dictionaryCredits(String sources);
 
+  /// No description provided for @dictionarySourcesTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Sources'**
+  String get dictionarySourcesTitle;
+
   /// No description provided for @dictionaryLookUp.
   ///
   /// In en, this message translates to: