i18n documentation - added note for caching in multi language modules

docs/en/topics/i18n.md

@@ -205,6 +205,17 @@ the PHP version of the function.
 	
 	// Using injection to add variables into the translated strings (note that $Name and $Greeting must be available in the current template scope).
 	<%t Header.Greeting "Hello {name} {greeting}" name=$Name greeting=$Greeting %>
+	
+#### Caching in Template Files with locale switching
+
+When caching a `<% loop %>` or `<% with %>` with `<%t params %>`. It is important to add the Locale to the cache key otherwise it won't pick up locale changes.
+
+	::::ss
+	<% cached 'MyIdentifier', $CurrentLocale %>
+		<% loop $Students %>
+			$Name
+		<% end_loop %>
+	<% end_cached %>
 
 ## Collecting text