refactor: Improve translations for Simplified Chinese and Japanese

PR-244: #244

Author: Xiaokang2022

src/mkdocstrings_handlers/python/templates/material/_base/languages/ja.html.jinja

@@ -10,20 +10,20 @@
 {% macro t(key) %}{{ {
   "ATTRIBUTE": "属性",
   "Attributes:": "属性：",
-  "Classes:": "",
-  "CLASS": "",
+  "Classes:": "クラス：",
+  "CLASS": "クラス",
   "DEFAULT:": "デフォルト：",
   "Default": "デフォルト",
   "default:": "デフォルト：",
   "DESCRIPTION": "デスクリプション",
   "Description": "デスクリプション",
   "Examples:": "例：",
-  "Functions:": "",
-  "FUNCTION": "",
-  "Methods:": "",
-  "METHOD": "",
-  "Modules:": "",
-  "MODULE": "",
+  "Functions:": "関数：",
+  "FUNCTION": "関数",
+  "Methods:": "メソッド：",
+  "METHOD": "メソッド",
+  "Modules:": "モジュール：",
+  "MODULE": "モジュール",
   "Name": "名前",
   "Other Parameters:": "他の引数：",
   "PARAMETER": "引数",

src/mkdocstrings_handlers/python/templates/material/_base/languages/zh.html.jinja

@@ -10,20 +10,20 @@
 {% macro t(key) %}{{ {
   "ATTRIBUTE": "属性",
   "Attributes:": "属性：",
-  "Classes:": "",
-  "CLASS": "",
+  "Classes:": "类：",
+  "CLASS": "类",
   "DEFAULT:": "默认：",
   "Default": "默认",
   "default:": "默认：",
   "DESCRIPTION": "描述",
   "Description": "描述",
   "Examples:": "示例：",
-  "Functions:": "",
-  "FUNCTION": "",
-  "Methods:": "",
-  "METHOD": "",
-  "Modules:": "",
-  "MODULE": "",
+  "Functions:": "函数：",
+  "FUNCTION": "函数",
+  "Methods:": "方法：",
+  "METHOD": "方法",
+  "Modules:": "模块：",
+  "MODULE": "模块",
   "Name": "名称",
   "Other Parameters:": "其他参数：",
   "PARAMETER": "参数",

src/mkdocstrings_handlers/python/templates/readthedocs/_base/languages/ja.html.jinja

@@ -4,20 +4,20 @@
 {% macro t(key) %}{{ {
   "ATTRIBUTE": "属性",
   "Attributes:": "属性：",
-  "Classes:": "",
-  "CLASS": "",
+  "Classes:": "クラス：",
+  "CLASS": "クラス",
   "DEFAULT:": "デフォルト：",
   "Default": "デフォルト",
   "default:": "デフォルト：",
   "DESCRIPTION": "デスクリプション",
   "Description": "デスクリプション",
   "Examples:": "例：",
-  "Functions:": "",
-  "FUNCTION": "",
-  "Methods:": "",
-  "METHOD": "",
-  "Modules:": "",
-  "MODULE": "",
+  "Functions:": "関数：",
+  "FUNCTION": "関数",
+  "Methods:": "メソッド：",
+  "METHOD": "メソッド",
+  "Modules:": "モジュール：",
+  "MODULE": "モジュール",
   "Name": "名前",
   "Other Parameters:": "他の引数：",
   "PARAMETER": "引数",

src/mkdocstrings_handlers/python/templates/readthedocs/_base/languages/zh.html.jinja

@@ -4,20 +4,20 @@
 {% macro t(key) %}{{ {
   "ATTRIBUTE": "属性",
   "Attributes:": "属性：",
-  "Classes:": "",
-  "CLASS": "",
+  "Classes:": "类：",
+  "CLASS": "类",
   "DEFAULT:": "默认：",
   "Default": "默认",
   "default:": "默认：",
   "DESCRIPTION": "描述",
   "Description": "描述",
   "Examples:": "示例：",
-  "Functions:": "",
-  "FUNCTION": "",
-  "Methods:": "",
-  "METHOD": "",
-  "Modules:": "",
-  "MODULE": "",
+  "Functions:": "函数：",
+  "FUNCTION": "函数",
+  "Methods:": "方法：",
+  "METHOD": "方法",
+  "Modules:": "模块：",
+  "MODULE": "模块",
   "Name": "名称",
   "Other Parameters:": "其他参数：",
   "PARAMETER": "参数",