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/cs_CZ/Attachment.json

@@ -1 +1,28 @@
-{}
+{
+  "insertFromSourceLabels": {
+    "Document": "Vložit dokument"
+  },
+  "fields": {
+    "related": "Příbuzný",
+    "file": "Soubor",
+    "type": "Typ",
+    "field": "Pole",
+    "sourceId": "Zdrojové ID",
+    "storage": "Úložiště",
+    "size": "Velikost v bytech",
+    "isBeingUploaded": "Nahrává se"
+  },
+  "options": {
+    "role": {
+      "Attachment": "Příloha",
+      "Inline Attachment": "Vložená příloha",
+      "Import File": "Importovat soubor",
+      "Export File": "Exportovat soubor",
+      "Mail Merge": "Spojit Emaily",
+      "Mass Pdf": "Hromadná tvorba PDF"
+    }
+  },
+  "presetFilters": {
+    "orphan": "Sirotek"
+  }
+}