add Japanese translations, update translation docs

docs/README.md

@@ -68,7 +68,7 @@ French     | ❑ not translated
 German     | ✓ [fully translated](../src/SMAPI/i18n/de.json)
 Hungarian  | ❑ not translated
 Italian    | ❑ not translated
-Japanese   | ❑ not translated
+Japanese   | ✓ [fully translated](../src/SMAPI/i18n/ja.json)
 Korean     | ❑ not translated
 Portuguese | ✓ [fully translated](../src/SMAPI/i18n/pt.json)
 Russian    | ✓ [fully translated](../src/SMAPI/i18n/ru.json)

docs/release-notes.md

@@ -17,7 +17,7 @@
     * fixed spawning custom rings added by mods;
     * Fixed errors when some item data is invalid.
   * Internal optimizations.
-  * Updated translations. Thanks to L30Bola (added Portuguese) and PlussRolf (added Spanish)!
+  * Updated translations. Thanks to L30Bola (added Portuguese), PlussRolf (added Spanish), and shirutan (added Japanese)!
 
 * For the web UI:
   * Added option to edit & reupload in the JSON validator.

src/SMAPI/SMAPI.csproj

@@ -99,9 +99,30 @@
       <Link>SMAPI.metadata.json</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <None Update="i18n\de.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="i18n\es.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="i18n\ja.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="i18n\default.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="i18n\pt.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="i18n\ru.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="i18n\tr.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="i18n\zh.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="steam_appid.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>

src/SMAPI/i18n/ja.json

@@ -0,0 +1,3 @@
+{
+    "warn.invalid-content-removed": "クラッシュを防ぐために無効なコンテンツを取り除きました （詳細はSMAPIコンソールを参照）"
+}