feat: add spanish language

i18n/i18next-config.ts

@@ -2,8 +2,10 @@
 import i18n from 'i18next'
 import { initReactI18next } from 'react-i18next'
 import commonEn from './lang/common.en'
+import commonEs from './lang/common.es'
 import commonZh from './lang/common.zh'
 import appEn from './lang/app.en'
+import appEs from './lang/app.es'
 import appZh from './lang/app.zh'
 import type { Locale } from '.'
 
@@ -14,6 +16,12 @@ const resources = {
       app: appEn,
     },
   },
+  'es': {
+    translation: {
+      common: commonEs,
+      app: appEs,
+    },
+  },
   'zh-Hans': {
     translation: {
       common: commonZh,