添加黑色皮肤

src/renderer/lang/en-us/store/state.json

@@ -9,6 +9,7 @@
   "theme_grey": "Grey",
   "theme_ming": "Ming",
   "theme_blue2": "Purple Blue",
+  "theme_black": "Black",
   "theme_mid_autumn": "Mid-Autumn",
   "theme_naruto": "Naruto",
   "theme_happy_new_year": "New Year",

src/renderer/lang/zh-cn/store/state.json

@@ -9,6 +9,7 @@
   "theme_grey": "灰常美丽",
   "theme_ming": "青出于黑",
   "theme_blue2": "清热版蓝",
+  "theme_black": "黑纸白字",
   "theme_mid_autumn": "月里嫦娥",
   "theme_naruto": "木叶之村",
   "theme_happy_new_year": "新年快乐",

src/renderer/lang/zh-tw/store/state.json

@@ -9,6 +9,7 @@
   "theme_grey": "灰常美麗",
   "theme_ming": "青出於黑",
   "theme_blue2": "清熱版藍",
+  "theme_black": "黑紙白字",
   "theme_mid_autumn": "月裡嫦娥",
   "theme_naruto": "木葉之村",
   "theme_happy_new_year": "新年快樂",