fix: change "Date" label to "Posting Date" in Sales Invoice and Purchase Invoice (backport #53503) (#53516)

* fix: change "Date" label to "Posting Date" in Sales Invoice and Purchase Invoice (#53503)

(cherry picked from commit 4cd150ba7a)

# Conflicts:
#	erpnext/accounts/doctype/purchase_invoice/purchase_invoice.json
#	erpnext/accounts/doctype/sales_invoice/sales_invoice.json

* chore: resolve conflicts

* chore: resolve conflicts

---------

Co-authored-by: Abdus Samad <120767334+Samad-11@users.noreply.github.com>
Co-authored-by: Mihir Kandoi <kandoimihir@gmail.com>

erpnext/accounts/doctype/purchase_invoice/purchase_invoice.json

@@ -312,7 +312,7 @@
    "fieldname": "posting_date",
    "fieldtype": "Date",
    "in_list_view": 1,
-   "label": "Date",
+   "label": "Posting Date",
    "oldfieldname": "posting_date",
    "oldfieldtype": "Date",
    "print_hide": 1,

erpnext/accounts/doctype/sales_invoice/sales_invoice.json

@@ -373,7 +373,7 @@
    "fieldtype": "Date",
    "hide_days": 1,
    "hide_seconds": 1,
-   "label": "Date",
+   "label": "Posting Date",
    "no_copy": 1,
    "oldfieldname": "posting_date",
    "oldfieldtype": "Date",