fix(glossary): handle save errors and improve playlist controls

src/translate/translationservice.h

@@ -34,6 +34,7 @@ class TranslationService : public QObject
     Q_PROPERTY(bool fetchingModels READ isFetchingModels NOTIFY fetchingModelsChanged)
     Q_PROPERTY(QVariantList glossaryEntries READ glossaryEntries NOTIFY glossaryChanged)
     Q_PROPERTY(QString glossaryDirectory READ glossaryDirectory NOTIFY glossaryChanged)
+    Q_PROPERTY(QString glossaryError READ glossaryError NOTIFY glossaryErrorChanged)
 
 public:
     explicit TranslationService(QObject *parent = nullptr);
@@ -48,6 +49,7 @@ public:
     bool isFetchingModels() const;
     QVariantList glossaryEntries() const;
     QString glossaryDirectory() const;
+    QString glossaryError() const;
 
     // \a track is an entry of MpvItem::subtitleTracks.
     Q_INVOKABLE void translate(const QUrl &videoUrl, const QVariantMap &track, const QString &mediaTitle);
@@ -56,7 +58,7 @@ public:
     Q_INVOKABLE void fetchModels();
     Q_INVOKABLE void clearError();
     Q_INVOKABLE void loadGlossary(const QUrl &videoUrl);
-    Q_INVOKABLE void saveGlossary(const QVariantList &entries);
+    Q_INVOKABLE bool saveGlossary(const QVariantList &entries);
     Q_INVOKABLE void clearGlossary();
 
 Q_SIGNALS:
@@ -67,6 +69,7 @@ Q_SIGNALS:
     void availableModelsChanged();
     void fetchingModelsChanged();
     void glossaryChanged();
+    void glossaryErrorChanged();
     void translated(const QUrl &subtitleUrl, bool fromCache);
 
 private:
@@ -98,6 +101,7 @@ private:
     double m_progress = 0.0;
     QString m_statusText;
     QString m_errorText;
+    QString m_glossaryError;
     QStringList m_availableModels;
     bool m_fetchingModels = false;
     GlossaryStore::Glossary m_glossary;