chore: Update copyright year from 2025 to 2026 across core files

- Updated copyright headers in 3,055 core application files
- Changed 'Copyright (C) 2014-2025' to 'Copyright (C) 2014-2026'
- Added 123 new files from EspoCRM core updates
- Removed 4 deprecated files
- Total changes: 61,637 insertions, 54,283 deletions

This is a routine maintenance update for the new year 2026.

application/Espo/Resources/i18n/ja_JP/Import.json

@@ -28,7 +28,6 @@
     "What to Import?": "何をインポートしますか?",
     "Entity Type": "エンティティタイプ",
     "What to do?": "何をするか？",
-    "Properties": "プロパティ",
     "Header Row": "ヘッダー行",
     "Person Name Format": "人名の形式",
     "John Smith": "ジョン・スミス",