Rename DictionaryTest to DictionaryQuiz

src/data_provider/history.rs

@@ -39,7 +39,7 @@ fn parse_history_items(strings: Vec<String>) -> Vec<HistoryItem> {
                 continue;
             }
             items.push(HistoryItem {
-                timestamp: DateTime::from_timestamp(time.parse().unwrap_or_default(), 0).unwrap(),
+                timestamp: DateTime::from_timestamp(time.parse().unwrap_or_default(), 0).unwrap_or_default(),
                 word_id: id,
                 mode: match mode.parse::<u8>().unwrap_or_default() {
                     2 => WordOpenMode::Hard,