fix: use dummy translations for custom field labels (#49875)

(cherry picked from commit 9a989a84fb)

# Conflicts:
#	erpnext/setup/install.py
#	erpnext/setup/setup_wizard/operations/install_fixtures.py

erpnext/setup/utils.py

@@ -234,3 +234,15 @@ def welcome_email():
 	site_name = get_default_company() or "ERPNext"
 	title = _("Welcome to {0}").format(site_name)
 	return title
+
+
+def identity(x, *args, **kwargs):
+	"""Used for redefining the translation function to return the string as is.
+
+	We want to create english records but still mark the strings as translatable.
+	E.g. when the respective DocTypes have 'Translate Link Fields' enabled or
+	we're creating custom fields.
+
+	Use like this: `from erpnext.setup.utils import identity as _`
+	"""
+	return x