Update ICU to 58.1

source/data/translit/it_ja.txt

Index: source/data/translit/it_ja.txt
diff --git a/source/data/translit/it_ja.txt b/source/data/translit/it_ja.txt
index 27ec5e898206cc32915d880f695cf8888651c021..78e3a9bc0691f483b10189d58bf59475fa904b3b 100644
--- a/source/data/translit/it_ja.txt
+++ b/source/data/translit/it_ja.txt
@@ -1,19 +1,29 @@
-# ***************************************************************************
-# *
-# *  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: it_ja.txt
-# Generated from CLDR 
+# Generated from CLDR
 #
+
+# Italian to Katakana Transliteration Table for ICU
+# Based on:
+#   "現代イタリア語入門" (大学書林, 1974. ISBN:978-4475017176)
+#   http://ja.wikipedia.org/wiki/%E3%82%A4%E3%82%BF%E3%83%AA%E3%82%A2%E8%AA%9E
 ::NFD(NFC);
 ::Lower();
 ::[:Latin:] fullwidth-halfwidth();
+#
+#
+# Variables.
 $vowel = [aeiou];
 $consonant = [bcdfghjklmnpqrstvwxyz];
+#
+#
+# Ignore apostrophe.
 ($consonant) \' → | $1;
 \' → ;
+#
+#
 cqu → ック;
 cc → ッ | c;
 ca → カ;
@@ -23,11 +33,15 @@ ci → チ;
 cu → ク;
 ce → チェ;
 co → コ;
+#
+#
 cha → シャ;
 chi → キ;
 chu → チュ;
 che → ケ;
 cho → チョ;
+#
+#
 gg → ッ | g;
 ghi → ギ;
 ghe → ゲ;
@@ -38,6 +52,8 @@ gni → ニ;
 gnu → ヌ;
 gne → ニェ;
 gno → ニョ;
+#
+#
 ga → ガ;
 gia → ジャ;
 giu → ジュ;
@@ -46,18 +62,24 @@ gi → ジ;
 gu → グ;
 ge → ジェ;
 go → ゴ;
+#
+#
 rr → ッ | r;
 ra → ラ;
 ri → リ;
 ru → ル;
 re → レ;
 ro → ロ;
+#
+#
 ll → ッ | l;
 la → ラ;
 li → リ;
 lu → ル;
 le → レ;
 lo → ロ;
+#
+#
 tt → ッ | t;
 ta → タ;
 ti → ティ;
@@ -70,49 +92,68 @@ to → ト;
 tho → ト;
 tzu → | ッツ;
 tz → | zz;
+#
+#
 dd → ッ | d;
 da → ダ;
 di → ディ;
 du → ドゥ;
 de → デ;
 do → ド;
+#
+#
 ma → マ;
 mi → ミ;
 mu → ム;
 me → メ;
 mo → モ;
 m } $consonant → ン;
+#
+#
 na → ナ;
 ni → ニ;
 nu → ヌ;
 ne → ネ;
 no → ノ;
+#
+#
 ff → ッ | f;
 fa → ファ;
 fi → フィ;
 fu → フ;
 fe → フェ;
 fo → フォ;
+#
+#
 bb → ッ | b;
 ba → バ;
 bi → ビ;
 bu → ブ;
 be → ベ;
 bo → ボ;
+#
+#
 pp → ッ | p;
 pa → パ;
 pi → ピ;
 pu → プ;
 pe → ペ;
 po → ポ;
+#
+#
 vv → ッ | v;
 va → ヴァ;
 vi → ヴィ;
 vu → ヴ;
 ve → ヴェ;
 vo → ヴォ;
+#
+#
 sa } nt[ao] → サ;
 ss → ッ | \~s;
+#
+#
+# 's' is voiced before [bdglmnrv].
 sb → ズ | b;
 sd → ズ | d;
 sg → ズ | g;
@@ -121,46 +162,71 @@ sm → ズ | m;
 sn → ズ | n;
 sr → ズ | r;
 sv → ズ | v;
+#
+#
+# Force 's' after a consonat to be unvoiced.
 ($consonant) s } $vowel → | $1 \~ s;
 \~sa → サ;
 \~si → シ;
 \~su → ス;
 \~se → セ;
 \~so → ソ;
+#
+#
+# 's' at the beginning is usually unvoiced.
 [:^Letter:] { sa → サ;
 [:^Letter:] { si → シ;
 [:^Letter:] { su → ス;
 [:^Letter:] { se → セ;
 [:^Letter:] { so → ソ;
+#
+#
+# Otherwise voiced 's' are common.
 sa → ザ;
 si → ジ;
 su → ズ;
 se → ゼ;
 so → ゾ;
+#
+#
 scia → シャ;
 sci → シ;
 sce → シェ;
+#
+#
 zz → ッ | \~z;
+#
+# Force 'z' after a consonat to be unvoiced.
 ($consonant) z → | $1 \~z;
 \~za → ツァ;
 \~zi → ツィ;
 \~zu → ツ;
 \~ze → ツェ;
 \~zo → ツォ;
+#
+#
+# Otherwise voiced 'z' are common except for 'zi'.
 za → ザ;
 [:^Letter:] { zi → ジ;
 zi → ツィ;
 zu → ズ;
 ze → ゼ;
 zo → ゾ;
+#
+#
 ja → ヤ;
 je → イェ;
 j → | i;
+#
+#
+# Standalone vowels and consonants.
 a → ア;
 i → イ;
 u → ウ;
 e → エ;
 o → オ;
+#
+#
 b → ブ;
 c → ク;
 d → ド;
@@ -180,7 +246,20 @@ v → ヴ;
 x → | cs;
 y → | i;
 z → ツ;
+#
+#
+# word delimiter of transliterated foreign phrase is '・'.
 ' ' → ・;
+#
+#
+# Latin hyphen should be transliterated to U+30A0 (KATAKANA-HIRAGANA
+# DOUBLE HYPHEN), ideally. But since the character isn't supported by
+# many fonts or softwares, we use U+FF1D (FULLWIDTH EQUALS SIGN),
+# which is widely used as "double hyphen".
+#
 \- → ＝;
+#
+#
 [:nonspacing mark:] → ;
 ::NFC(NFD);
+