updated Japanese translation

(cherry-picked from commit b0f76a7d4d)

changelog.md

@@ -36,8 +36,8 @@
    * Fixed Logging Options tooltips not being translatable (bug #2837).
    * Fixed Version label on the title screen not being translatable (issue #2914).
    * Updated translations: British English, Chinese (Simplified), Czech, French,
-     Galician, German, Italian, Polish, Scottish Gaelic, Slovak, Spanish,
-     Ukrainian.
+     Galician, German, Italian, Japanese, Polish, Scottish Gaelic, Slovak,
+     Spanish, Ukrainian.
  ### Lua API
    * Fix wesnoth.show_popup_dialog and wesnoth.show_message_box not accepting
      translatable strings

data/core/about_i18n.cfg

@@ -1013,6 +1013,10 @@ sort=yes
         email = "iwaim.sub_AT_gmail.com"
         wikiuser = "Iwaim"
     [/entry]
+    [entry]
+        name = "kateiteki"
+        email = "kateitekino_hito@yahoo.co.jp"
+    [/entry]
     [entry]
         name = "kudoh"
     [/entry]
@@ -1053,6 +1057,10 @@ sort=yes
     [entry]
         name = "Shigerello"
     [/entry]
+    [entry]
+        name = "suto3"
+        email = "suto3suto3_AT_gmail.com"
+    [/entry]
     [entry]
         name = "瀟湘夜雨"
     [/entry]

players_changelog.md

@@ -8,8 +8,8 @@ changelog: https://github.com/wesnoth/wesnoth/blob/master/changelog.md
      * New set of story art.
  ### Language and i18n
    * Updated translations: British English, Chinese (Simplified), Czech, French,
-     Galician, German, Italian, Polish, Scottish Gaelic, Slovak, Spanish,
-     Ukrainian.
+     Galician, German, Italian, Japanese, Polish, Scottish Gaelic, Slovak,
+     Spanish, Ukrainian.
  ### User Interface
    * Implemented MP chat message history saving (issue #1194, issue #2802).
  ### Miscellaneous and bug fixes