Add language 'olo' Livvi-Karelian

First export with I4893e65a430118dbe35f90144afa492899f90150

Change-Id: I8b77182c0c09058d7361785bc1af0194bcc80ae6

RELEASE-NOTES-1.26

@@ -151,6 +151,8 @@ changes to languages because of Phabricator reports.
 ** dty (डोटेली/Doteli), thanks to translators जनक राज भट्ट, बिप्लब आनन्द,
    मेश सिंह बोहरा, and राम प्रसाद जोशी
 ** luz (لئری دوٙمینی / Southern Luri)
+** olo (Livvinкarjala / Livvi-Karelian), thanks to translators Denö, Hiloin Natoi,
+   Ilja.mos, and Mashoi7
 
 === Other changes in 1.26 ===
 * ChangeTags::tagDescription() will return false if the interface message

languages/Names.php

@@ -306,6 +306,7 @@
 	'nv' => 'Diné bizaad',	# Navajo
 	'ny' => 'Chi-Chewa',	# Chichewa
 	'oc' => 'occitan',		# Occitan
+	'olo' => 'Livvinкarjala',		# Livvi-Karelian
 	'om' => 'Oromoo',		# Oromo
 	'or' => 'ଓଡ଼ିଆ',		# Oriya
 	'os' => 'Ирон', # Ossetic, bug 29091

languages/messages/MessagesOlo.php

@@ -0,0 +1,14 @@
+<?php
+/** Livvi-Karelian (Livvinкarjala)
+ *
+ * To improve a translation please visit https://translatewiki.net
+ *
+ * @ingroup Language
+ * @file
+ *
+ */
+
+$fallback = 'ru';
+
+$linkTrail = '/^([a-zčČšŠžŽäÄöÖ]+)(.*)$/sDu';
+