fix(UX): Better message for read only mode

- The default message keeps confusing user because it doesn't contain the word "site update" which is usually the reason for putting site in read only mode.
- Also fixes annoying popup while opening notifications in read only mode.

[skip ci]

frappe/database/database.py

@@ -233,7 +233,7 @@ class Database:
 			elif self.is_read_only_mode_error(e):
 				frappe.throw(
 					_(
-						"Site is running in read only mode, this action can not be performed right now. Please try again later."
+						"Site is running in read only mode for maintenance or site update, this action can not be performed right now. Please try again later."
 					),
 					title=_("In Read Only Mode"),
 					exc=frappe.InReadOnlyMode,

frappe/desk/doctype/notification_settings/notification_settings.py

@@ -92,4 +92,7 @@ def get_permission_query_conditions(user):
 
 @frappe.whitelist()
 def set_seen_value(value, user):
+	if frappe.flags.read_only:
+		return
+
 	frappe.db.set_value("Notification Settings", user, "seen", value, update_modified=False)

frappe/public/js/frappe/ui/toolbar/navbar.html

@@ -7,7 +7,7 @@
 		<div class="collapse navbar-collapse justify-content-end">
 			<form class="form-inline fill-width justify-content-end" role="search" onsubmit="return false;">
 				{% if (frappe.boot.read_only) { %}
-					<span class="indicator-pill yellow no-indicator-dot" title="{%= __("Your site is getting upgraded.") %}">
+					<span class="indicator-pill yellow no-indicator-dot" title="{%= __("Your site is undergoing maintenance or being updated.") %}">
 						{%= __("Read Only Mode") %}
 					</span>
 				{% } %}