diff --git a/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter.rb b/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter.rb
index 73a09b15f..595c6cf58 100644
--- a/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter.rb
+++ b/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter.rb
@@ -48,8 +48,11 @@ module Redmine
             icon_name = ALERT_TYPE_TO_ICON_NAME[alert_type]
             next unless icon_name # Skip if no specific icon is defined for this alert type
 
-            # label alert translation
-            node.content = ::I18n.t("label_alert_#{alert_type}", default: node.content)
+            # Translate the alert title only if it matches a known alert type
+            # (i.e., the title has not been overridden)
+            if ALERT_TYPE_TO_ICON_NAME.key?(node.content.downcase)
+              node.content = ::I18n.t("label_alert_#{alert_type}", default: node.content)
+            end
 
             icon_html = ApplicationController.helpers.sprite_icon(icon_name, node.text)