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/el_GR/Attachment.json

@@ -0,0 +1,20 @@
+{
+  "insertFromSourceLabels": {
+    "Document": "Εισαγωγή εγγράφου"
+  },
+  "fields": {
+    "role": "Ρόλος",
+    "related": "Σχετικό",
+    "file": "Αρχείο",
+    "type": "Πληκτρολογήστε",
+    "field": "Πεδίο",
+    "size": "Μέγεθος (bytes)"
+  },
+  "options": {
+    "role": {
+      "Attachment": "Συνημμένο",
+      "Import File": "Εισαγωγή αρχείου",
+      "Export File": "Εξαγωγή αρχείου"
+    }
+  }
+}