优化

app/src/main/java/io/legado/app/model/CacheBook.kt

@@ -171,7 +171,7 @@ class CacheBook(var bookSource: BookSource, var book: Book) {
             waitDownloadSet.add(index)
         } else {
             AppLog.addLog(
-                "download ${book.name}-${chapterTitle} error:${error.localizedMessage}",
+                "下载${book.name}-${chapterTitle}失败\n${error.localizedMessage}",
                 error
             )
             error.printOnDebug()

app/src/main/java/io/legado/app/ui/main/MainViewModel.kt

@@ -91,7 +91,7 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
                         )
                         CacheBook.start(context, book.bookUrl, book.durChapterIndex, endIndex)
                     }.onError(upTocPool) {
-                        AppLog.addLog("${book.name} 更新目录失败 error: ${it.localizedMessage}", it)
+                        AppLog.addLog("${book.name} 更新目录失败\n${it.localizedMessage}", it)
                         it.printOnDebug()
                     }.onFinally(upTocPool) {
                         synchronized(this) {