feat(i18n): add Chinese translations

src/i18n/index.ts

@@ -4,6 +4,7 @@ import isNodeJs from 'detect-node'
 import en from './en'
 import es from './es'
 import it from './it'
+import zh from './zh'
 
 export interface LOCALE {
   'PROCESSING' (): string;
@@ -17,15 +18,16 @@ export interface LOCALE {
   'IND_PARTS' (): string;
   'IND_PARTS_TOOLTIP' (): string;
 
-  'FULL_SCORE' (): string;
-
   'VIEW_IN_LIBRESCORE' (): string;
+
+  'FULL_SCORE' (): string;
 }
 
 const locales = (<L extends { [n: string]: LOCALE } /** type checking */> (l: L) => Object.freeze(l))({
   en,
   es,
   it,
+  zh,
 })
 
 // detect browser language

src/i18n/zh.ts

@@ -0,0 +1,37 @@
+
+import { createLocale } from './utils'
+
+export default createLocale({
+  'PROCESSING' () {
+    return '处理中…' as const
+  },
+  'BTN_ERROR' () {
+    return '❌下载失败!' as const
+  },
+
+  'DEPRECATION_NOTICE' (btnName: string) {
+    return `不建议使用\n请使用 \`单独分谱\` 里的 \`${btnName}\` 按钮代替\n（这也许仍会起作用。单击\`确定\`以继续。）` as const
+  },
+
+  'DOWNLOAD' <T extends string> (fileType: T) {
+    return `下载 ${fileType}` as const
+  },
+  'DOWNLOAD_AUDIO' <T extends string> (fileType: T) {
+    return `下载 ${fileType} 音频` as const
+  },
+
+  'IND_PARTS' () {
+    return '单独分谱' as const
+  },
+  'IND_PARTS_TOOLTIP' () {
+    return '下载单独分谱 (BETA)' as const
+  },
+
+  'VIEW_IN_LIBRESCORE' () {
+    return '在 LibreScore 中查看' as const
+  },
+
+  'FULL_SCORE' () {
+    return '完整乐谱' as const
+  },
+})