Update ICU to 58.1

source/data/translit/tr_Lower.txt

Index: source/data/translit/tr_Lower.txt
diff --git a/source/data/translit/tr_Lower.txt b/source/data/translit/tr_Lower.txt
index da10a1e8743f104d449b80c36818deeff81b886c..8fbf10689ab8175656aa33b500253dc2e0a8c1b8 100644
--- a/source/data/translit/tr_Lower.txt
+++ b/source/data/translit/tr_Lower.txt
@@ -1,13 +1,19 @@
-# ***************************************************************************
-# *
-# *  Copyright (C) 2004-2015, International Business Machines
-# *  Corporation; Unicode, Inc.; and others.  All Rights Reserved.
-# *
-# ***************************************************************************
+# © 2016 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html#License
+#
 # File: tr_Lower.txt
-# Generated from CLDR 
+# Generated from CLDR
 #
+
+# I and i-dotless; I-dot and i are case pairs in Turkish and Azeri
+# 0130; 0069; 0130; 0130; tr; # LATIN CAPITAL LETTER I WITH DOT ABOVE
 İ→i;
+# When lowercasing, remove dot_above in the sequence I + dot_above, which will turn into i.
+# This matches the behavior of the canonically equivalent I-dot_above
+# 0307; ; 0307; 0307; tr After_I; # COMBINING DOT ABOVE
+# When lowercasing, unless an I is before a dot_above, it turns into a dotless i.
+# 0049; 0131; 0049; 0049; tr Not_Before_Dot; # LATIN CAPITAL LETTER I
 I([^[:ccc=Not_Reordered:][:ccc=Above:]]*)\u0307 → i$1 ;
 I→ı ;
 ::Any-Lower();
+