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)
 
diff --git a/test/unit/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter_test.rb b/test/unit/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter_test.rb
index 099c7a486..43abfc5f7 100644
--- a/test/unit/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/common_mark/alerts_icons_filter_test.rb
@@ -52,5 +52,16 @@ if Object.const_defined?(:Commonmarker)
       expected = %r{<span class="icon-label">#{I18n.t('label_alert_note')}</span>}
       assert_match expected, html
     end
+
+    def test_should_not_translate_title_if_overridden
+      set_language_if_valid 'de'
+      text = <<~MD
+        > [!note] Custom Note Title
+        > This is a note.
+      MD
+      html = filter(format(text))
+      assert_match %r{<span class="icon-label">Custom Note Title</span>}, html
+    end
+
   end
 end