feat(jellyfin): any stretch of a line's characters chosen by hand

The cut takes the longest word and knows no grammar, so 今日は reads as
こんにちは where it is 今日 and は. Any stretch of a line's characters can
now be chosen by hand: dragged across with a mouse, Shift+clicked from
the word or stretch chosen, or on a touch screen held on a character and
dragged on. It is looked up as one word, as it stands or as a form of
one, in one small request (the instance has the line's text already);
while it is chosen the line reads it as that word (きょう over 今日), and
what the dictionary lacks as one word is offered as a search on Jisho.

The line's words move into line_words.dart, out of the Watch screen.

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

halkyon_learn_flutter/lib/l10n/app_localizations_en.dart

@@ -6786,7 +6786,20 @@ class AppLocalizationsEn extends AppLocalizations {
   }
 
   @override
-  String get watchTapAWord => 'Tap a word of the subtitles to look it up.';
+  String watchStretchNone(String text) {
+    return '$text isn\'t in the dictionary as one word.';
+  }
+
+  @override
+  String get watchStretchFailed =>
+      'Couldn\'t look it up. Choose it again to try once more.';
+
+  @override
+  String get watchStretchJisho => 'Search Jisho for it';
+
+  @override
+  String get watchTapAWord =>
+      'Tap a word of the subtitles to look it up, or drag across characters to look up any part of a line (on a touch screen, hold first).';
 
   @override
   String watchFormOf(String word) {