[gimp] build: add Japanese translation to the Windows installer

[Ell <ell src gnome org>]

commit 0c06c24441accd24efb85d68868663a0169f7d23
Author: Ell <ell_se yahoo com>
Date:   Sun Jun 7 16:38:20 2020 +0300

    build: add Japanese translation to the Windows installer

 build/windows/installer/gimp3264.iss     | 1 +
 build/windows/installer/lang/Makefile.am | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/build/windows/installer/gimp3264.iss b/build/windows/installer/gimp3264.iss
index 1be29fc4c3..940a28c535 100755
--- a/build/windows/installer/gimp3264.iss
+++ b/build/windows/installer/gimp3264.iss
@@ -175,6 +175,7 @@ Name: "hu"; MessagesFile: "compiler:Languages\Hungarian.isl,lang\hu.setup.isl"
 Name: "id"; MessagesFile: "compiler:Languages\Unofficial\Indonesian.isl,lang\id.setup.isl"
 Name: "is"; MessagesFile: "compiler:Languages\Unofficial\Icelandic.isl,lang\is.setup.isl"
 Name: "it"; MessagesFile: "compiler:Languages\Italian.isl,lang\it.setup.isl"
+Name: "ja"; MessagesFile: "compiler:Languages\Japanese.isl,lang\ja.setup.isl"
 Name: "ko"; MessagesFile: "compiler:Languages\Unofficial\Korean.isl,lang\ko.setup.isl"
 Name: "lv"; MessagesFile: "compiler:Languages\Unofficial\Latvian.isl,lang\lv.setup.isl"
 Name: "nl"; MessagesFile: "compiler:Languages\Dutch.isl,lang\nl.setup.isl"
diff --git a/build/windows/installer/lang/Makefile.am b/build/windows/installer/lang/Makefile.am
index d0171c33b3..1cdf94e027 100644
--- a/build/windows/installer/lang/Makefile.am
+++ b/build/windows/installer/lang/Makefile.am
@@ -23,6 +23,7 @@ languages = \
        id:[id]:ISO-8859-1              \
        is:[is]:WINDOWS-1252            \
        it:[it]:WINDOWS-1252            \
+       ja:[ja]:CP932                   \
        ko:[ko]:EUC-KR                  \
        lv:[lv]:ISO-8859-13             \
        nl:[nl]:WINDOWS-1252            \