automatically detect file encoding when importing delimiter-separated values (DSV) file

src/locales/ja.json

@@ -1443,6 +1443,7 @@
     "No results": "結果はありません",
     "Unknown": "不明",
     "Auto detect": "自動検出",
+    "Detecting...": "Detecting...",
     "Miscellaneous": "その他",
     "Default": "デフォルト",
     "Included": "Included",
@@ -1896,6 +1897,7 @@
     "Data File": "データファイル",
     "Data to import": "インポートするデータ",
     "Please select a file to import": "インポートするファイルを選択してください",
+    "Unable to detect the file encoding automatically. Please select the actual encoding.": "Unable to detect the file encoding automatically. Please select the actual encoding.",
     "Include Header Line": "ヘッダー行を含める",
     "Time Format": "時刻形式",
     "Transaction Type Mapping": "取引タイプのマッピング",