i18n(ko): add Korean (한국어) translation (#15863)

### What problem does this PR solve?

- Add `web/src/locales/ko.ts` with full Korean translation (~3100 keys)
- Register `Ko = 'ko'` in `LanguageAbbreviation` enum (`common.ts`)
- Add `[LanguageAbbreviation.Ko]: '한국어'` to `LanguageAbbreviationMap`
- Add lazy-load entry in `web/src/locales/config.ts`
- Add `korean` key to all existing locale files (`ja`, `id`, `es`,
`pt-br`, `vi`, `zh-traditional`)
- Fix duplicate enum value `FileMimeType.Mdx` (`'text/markdown'` →
`'text/mdx'`)

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Other (please describe): Korean (한국어) i18n translation + fix
duplicate FileMimeType.Mdx enum value

web/src/constants/common.ts

@@ -94,6 +94,7 @@ export enum LanguageAbbreviation {
   Bg = 'bg',
   Ar = 'ar',
   Tr = 'tr',
+  Ko = 'ko',
 }
 
 export const LanguageAbbreviationMap = {
@@ -112,6 +113,7 @@ export const LanguageAbbreviationMap = {
   [LanguageAbbreviation.Bg]: 'Български',
   [LanguageAbbreviation.Ar]: 'العربية',
   [LanguageAbbreviation.Tr]: 'Türkçe',
+  [LanguageAbbreviation.Ko]: '한국어',
 };
 
 export const LanguageTranslationMap = {
@@ -165,7 +167,7 @@ export enum FileMimeType {
   Mp4 = 'video/mp4',
   Json = 'application/json',
   Md = 'text/markdown',
-  Mdx = 'text/markdown',
+  Mdx = 'text/mdx',
 }
 
 export const Domain = 'cloud.ragflow.io';

web/src/locales/config.ts

@@ -27,6 +27,7 @@ const languageImports: Record<string, () => Promise<{ default: any }>> = {
   [LanguageAbbreviation.Bg]: () => import('./bg'),
   [LanguageAbbreviation.Ar]: () => import('./ar'),
   [LanguageAbbreviation.Tr]: () => import('./tr'),
+  [LanguageAbbreviation.Ko]: () => import('./ko'),
 };
 
 const supportedLanguageCodes: Intl.UnicodeBCP47LocaleIdentifier[] =

web/src/locales/es.ts

@@ -945,6 +945,7 @@ export default {
       bulgarian: 'Búlgaro',
       arabic: 'Árabe',
       turkish: 'Turco',
+      korean: 'Coreano',
     },
   },
 };

web/src/locales/id.ts

@@ -1147,6 +1147,7 @@ export default {
       bulgarian: 'Bulgaria',
       arabic: 'Arab',
       turkish: 'Turki',
+      korean: 'Korea',
     },
   },
 };

web/src/locales/ja.ts

@@ -1209,6 +1209,7 @@ export default {
       bulgarian: 'ブルガリア語',
       arabic: 'アラビア語',
       turkish: 'トルコ語',
+      korean: '韓国語',
     },
   },
 };

web/src/locales/pt-br.ts

@@ -1209,6 +1209,7 @@ export default {
       bulgarian: 'Búlgaro',
       arabic: 'Árabe',
       turkish: 'Turco',
+      korean: 'Coreano',
     },
   },
 };

web/src/locales/vi.ts

@@ -1258,6 +1258,7 @@ export default {
       bulgarian: 'Tiếng Bulgaria',
       arabic: 'Tiếng Ả Rập',
       turkish: 'Tiếng Thổ Nhĩ Kỳ',
+      korean: 'Tiếng Hàn',
     },
   },
 };

web/src/locales/zh-traditional.ts

@@ -1294,6 +1294,7 @@ export default {
       bulgarian: '保加利亞語',
       arabic: '阿拉伯語',
       turkish: '土耳其語',
+      korean: '韓語',
     },
     modal: {
       okText: '確認',