Karelian (krl) to Names.php and RELEASE-NOTES-1.28

* Added Karelian (krl) to Names.php.
* Added mention to RELEASE-NOTES-1.28
* Created MessagesKrl.php and $fallback = 'fi';

Bug: T137415
Change-Id: Iee2d03d042c8b514ee2575450a37158b26c732a3

RELEASE-NOTES-1.28

@@ -199,6 +199,8 @@ changes to languages because of Phabricator reports.
   Saiddzone Saimawnkham, Saosukham, and Sengwan.
 * Czech (cs) and Slovak (sk) set as reciprocal fallbacks.
 * (T146744) Livvi-Karelian (olo) namespace messages created thanks to translator Ilja.mos.
+* Karelian (krl), thanks to translators Flrn, Ilja.mos, Likopiän tyttö, Mashoi7, Matma Rex,
+  Ontoi, Theunitedstatesofme, and Varvana.
 
 === Other changes in 1.28 ===
 * (T128697) Improved handling of large diffs.

languages/data/Names.php

@@ -241,6 +241,7 @@ class Names {
 		'krc' => 'къарачай-малкъар', # Karachay-Balkar
 		'kri' => 'Krio', # Krio
 		'krj' => 'Kinaray-a', # Kinaray-a
+		'krl' => 'karjal', # Karelian
 		'ks' => 'कॉशुर / کٲشُر', # Kashmiri (multiple scripts - defaults to Perso-Arabic)
 		'ks-arab' => 'کٲشُر', # Kashmiri (Perso-Arabic script)
 		'ks-deva' => 'कॉशुर', # Kashmiri (Devanagari script)

languages/messages/MessagesKrl.php

@@ -0,0 +1,11 @@
+<?php
+/** Karelian (Karlaj)
+ *
+ * To improve a translation please visit https://translatewiki.net
+ *
+ * @ingroup Language
+ * @file
+ *
+ */
+
+$fallback = 'fi'; // T137415