Update docs & add language code validation

core/modules/wiki.js

@@ -371,6 +371,7 @@ Sort an array of tiddler titles by a specified field
 */
 exports.sortTiddlers = function(titles,sortField,isDescending,isCaseSensitive,isNumeric,isAlphaNumeric,locale) {
 	var self = this;
+	locale = $tw.utils.checkLanguageCode(locale) ? locale : undefined;
 	if(sortField === "title") {
 		if(!isNumeric && !isAlphaNumeric) {
 			if(isCaseSensitive) {
@@ -380,7 +381,7 @@ exports.sortTiddlers = function(titles,sortField,isDescending,isCaseSensitive,is
 					});
 				} else {
 					titles.sort(function(a,b) {
-						return a.localeCompare(b);
+						return a.localeCompare(b, locale);
 					});
 				}	
 			} else {

editions/tw5.com/tiddlers/Locale Example.tid

@@ -1,6 +1,6 @@
 created: 20251001034405510
-list: A a Ä ä Z z
-modified: 20251001034911337
+list: A a Ä ä Z z I ı İ i Ö ö Ü ü
+modified: 20251107113112003
 tags: 
 title: Locale Example
 type: text/vnd.tiddlywiki

editions/tw5.com/tiddlers/filters/examples/sort.tid

@@ -1,5 +1,5 @@
 created: 20150124112340000
-modified: 20251001034921899
+modified: 20251107113531458
 tags: [[sort Operator]] [[Operator Examples]]
 title: sort Operator (Examples)
 type: text/vnd.tiddlywiki
@@ -11,5 +11,10 @@ type: text/vnd.tiddlywiki
 <<.operator-example 3 "one two Three four +[sort[]]">>
 <<.operator-example 4 "[prefix[Tiddl]sort[text]]">>
 <<.operator-example 5 "[has[created]sort[created]limit[10]]" "the oldest 10 tiddlers in the wiki">>
-<<.operator-example 6 "[list[Locale Example]sort[],[de]]">>
+
+! Using a custom locale
+The following examples shows the differences when using the sort operator with default, Swedish and Turkish locale.
+
+<<.operator-example 6 "[list[Locale Example]sort[]]">>
 <<.operator-example 7 "[list[Locale Example]sort[],[sv]]">>
+<<.operator-example 8 "[list[Locale Example]sort[],[tr]]">>