lib/_data_ingestion: add phrases for language source data

lib/_data_ingestion/jmdict/objects.dart

@@ -97,7 +97,7 @@ class LanguageSource extends SQLWritable {
 
   const LanguageSource({
     required this.language,
-    this.phrase,
+    required this.phrase,
     this.fullyDescribesSense = true,
     this.constructedFromSmallerWords = false,
   });

lib/_data_ingestion/jmdict/seed_data.dart

@@ -141,12 +141,6 @@ Future<void> seedJMDictData(List<Entry> entries, Database db) async {
       for (final p in s.pos) {
         b.insert(JMdictTableNames.sensePOS, {'senseId': s.id, 'pos': p});
       }
-      for (final l in s.languageSource) {
-        b.insert(
-          JMdictTableNames.senseLanguageSource,
-          l.sqlValue..addAll({'senseId': s.id}),
-        );
-      }
       for (final rk in s.restrictedToKanji) {
         b.insert(
           JMdictTableNames.senseRestrictedToKanji,

lib/_data_ingestion/jmdict/xml_parser.dart

@@ -151,6 +151,7 @@ List<Entry> parseJMDictData(XmlElement root) {
             .map(
               (e) => LanguageSource(
                 language: e.getAttribute('xml:lang') ?? 'eng',
+                phrase: e.innerText.isNotEmpty ? e.innerText : null,
                 fullyDescribesSense: e.getAttribute('ls_type') == 'part',
                 constructedFromSmallerWords: e.getAttribute('ls_wasei') == 'y',
               ),