Fix alphabetic sorting for tables, plain lists

* org-table.el (org-table-sort-lines): Use collated sorting.
* org-list.el (org-sort-list): Use collated sorting.

Cf. commit 551d2f1fe.

etc/ORG-NEWS

@@ -106,6 +106,12 @@ document, use =shrink= value instead, or in addition to align:
 ,#+STARTUP: align shrink
 #+END_EXAMPLE
 
+*** Alphabetic sorting in tables and lists
+
+When sorting alphabetically, ~org-table-sort-lines~ and ~org-sort-list~
+now sort according to the locale’s collation rules instead of by
+code-point.
+
 ** New features
 *** Add support for links to LaTeX equations in HTML export
 Use MathJax links when enabled (by ~org-html-with-latex~), otherwise

lisp/org-list.el

@@ -2804,7 +2804,8 @@ Sorting can be alphabetically, numerically, by date/time as given
 by a time stamp, by a property or by priority.
 
 Comparing entries ignores case by default.  However, with an
-optional argument WITH-CASE, the sorting considers case as well.
+optional argument WITH-CASE, the sorting considers case as well,
+if the current locale allows for it.
 
 The command prompts for the sorting type unless it has been given
 to the function through the SORTING-TYPE argument, which needs to
@@ -2850,7 +2851,7 @@ function is being called interactively."
 		   (error "Missing key extractor"))))
 	 (sort-func
 	  (cond
-	   ((= dcst ?a) #'string<)
+	   ((= dcst ?a) #'org-string-collate-lessp)
 	   ((= dcst ?f)
 	    (or compare-func
 		(and interactive?

lisp/org-table.el

@@ -1794,7 +1794,7 @@ function is being called interactively."
 	     (predicate
 	      (cl-case sorting-type
 		((?n ?N ?t ?T) #'<)
-		((?a ?A) #'string<)
+		((?a ?A) #'org-string-collate-lessp)
 		((?f ?F)
 		 (or compare-func
 		     (and interactive?