1st stage, only language switch.

Thank you, MomentQYC ( https://github.com/MomentQYC ).
Your first attemt encourage me.

1 files changed, 173 insertions, 0 deletions

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5139a4a..4792565 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -44,6 +44,27 @@ importers:
       generate-rsa-keypair:
         specifier: ^0.2.1
         version: 0.2.1
+      handlebars:
+        specifier: ^4.7.8
+        version: 4.7.8
+      handlebars-i18next:
+        specifier: ^1.0.3
+        version: 1.0.3(handlebars@4.7.8)(i18next@24.2.2(typescript@5.4.5))
+      i18next:
+        specifier: ^24.2.2
+        version: 24.2.2(typescript@5.4.5)
+      i18next-browser-languagedetector:
+        specifier: ^8.0.4
+        version: 8.0.4
+      i18next-fs-backend:
+        specifier: ^2.6.0
+        version: 2.6.0
+      i18next-http-backend:
+        specifier: ^3.0.2
+        version: 3.0.2
+      i18next-http-middleware:
+        specifier: ^3.7.1
+        version: 3.7.1
       ical:
         specifier: ^0.6.0
         version: 0.6.0
@@ -83,6 +104,9 @@ importers:
       randomstring:
         specifier: ^1.3.0
         version: 1.3.0
+      react-i18next:
+        specifier: ^15.4.1
+        version: 15.4.1(i18next@24.2.2(typescript@5.4.5))(react@19.0.0)
       request:
         specifier: ^2.88.2
         version: 2.88.2
@@ -105,6 +129,9 @@ importers:
       '@types/express':
         specifier: ^4.17.21
         version: 4.17.21
+      '@types/i18next-fs-backend':
+        specifier: ^1.2.0
+        version: 1.2.0
       '@types/ical':
         specifier: ^0.8.3
         version: 0.8.3
@@ -139,6 +166,10 @@ packages:
     resolution: {integrity: sha512-Ja18XcETdEl5mzzACGd+DKgaGJzPTCow7EglgwTmHdwokzDFYh/MHua6lU6DV/hjF2IaOJ4oX2nqnjG7RElKOw==}
     engines: {node: '>=6.9.0'}
 
+  '@babel/runtime@7.26.9':
+    resolution: {integrity: sha512-aA63XwOkcl4xxQa3HjPMqOP6LiK0ZDv3mUPYEFXkpHbaFjtGggE1A61FjFzJnB+p7/oy2gA8E+rcBNl/zC1tMg==}
+    engines: {node: '>=6.9.0'}
+
   '@colors/colors@1.5.0':
     resolution: {integrity: sha512-ooWCrlZP11i8GImSjTHYHLkvFDP48nS4+204nGb1RiX/WXYHmJA2III9/e2DWVabCESdW7hBAEzHRqUn9OUVvQ==}
     engines: {node: '>=0.1.90'}
@@ -417,6 +448,10 @@ packages:
   '@types/http-errors@2.0.4':
     resolution: {integrity: sha512-D0CFMMtydbJAegzOyHjtiKPLlvnm3iTZyZRSZoLq2mRhDdmLfIWOCYPfQJ4cu2erKghU++QvjcUjp/5h7hESpA==}
 
+  '@types/i18next-fs-backend@1.2.0':
+    resolution: {integrity: sha512-30XnjBF+SLndemvooRQRtcoD5xmF2nNNTa5RqE63+OWssaZOxN9r895ZvXUMbkk8YZr1Cy3scpQBZ6YXLH+jEg==}
+    deprecated: This is a stub types definition. i18next-fs-backend provides its own type definitions, so you do not need this installed.
+
   '@types/ical@0.8.3':
     resolution: {integrity: sha512-qPejGORaXOstmqyKzp0Qw9nXDPiWiahiJJcx4zMB0zJVg0rLfJ6bDip/naqagEqYTjKl/LI91399hR8zFwRJ5A==}
 
@@ -771,6 +806,9 @@ packages:
     resolution: {integrity: sha512-s4odpheTyydAbTBQepsqd2rNWGa2iV3cyo8g7zbI2QQYGLVsfbhmwukayS1XHppe02Oy1fg7mg6xoaraVJeEcg==}
     engines: {node: '>=0.8'}
 
+  cross-fetch@4.0.0:
+    resolution: {integrity: sha512-e4a5N8lVvuLgAWgnCrLr2PP0YyDOTHa9H/Rj54dirp61qXnNq46m82bRhNqIA5VccJtWBvPTFRV3TtvHUKPB1g==}
+
   cross-spawn@7.0.3:
     resolution: {integrity: sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==}
     engines: {node: '>= 8'}
@@ -1167,6 +1205,12 @@ packages:
   graphemer@1.4.0:
     resolution: {integrity: sha512-EtKwoO6kxCL9WO5xipiHTZlSzBm7WLT627TqC/uVRd0HKmq8NXyebnNYxDoBi7wt8eTWrUrKXCOVaFq9x1kgag==}
 
+  handlebars-i18next@1.0.3:
+    resolution: {integrity: sha512-B4AEDBcBo4cJ+ghY9DWpABNNEQye1TEI4bebXhPaXJ6qM/1jfIVPXD0mx82qj3ceD7LUeRuCYp5CPd+mK6SMGw==}
+    peerDependencies:
+      handlebars: '4'
+      i18next: '>=11'
+
   handlebars@4.7.8:
     resolution: {integrity: sha512-vafaFqs8MZkRrSX7sFVUdo3ap/eNiLnb4IakshzvP56X5Nr1iGKAIqdX6tMlm6HcNRIkr6AxO5jFEoJzzpT8aQ==}
     engines: {node: '>=0.4.7'}
@@ -1208,6 +1252,9 @@ packages:
     resolution: {integrity: sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==}
     engines: {node: '>=12'}
 
+  html-parse-stringify@3.0.1:
+    resolution: {integrity: sha512-KknJ50kTInJ7qIScF3jeaFRpMpE8/lfiTdzf/twXyPBLAGrLRTmkz3AdTnKeh40X8k9L2fdYwEp/42WGXIRGcg==}
+
   htmlparser2@8.0.2:
     resolution: {integrity: sha512-GYdjWKDkbRLkZ5geuHs5NY1puJ+PXwP7+fHPRz06Eirsb9ugf6d8kkXav6ADhcODhFFPMIXyxkxSuMf3D6NCFA==}
 
@@ -1235,6 +1282,26 @@ packages:
     resolution: {integrity: sha512-SEQu7vl8KjNL2eoGBLF3+wAjpsNfA9XMlXAYj/3EdaNfAlxKthD1xjEQfGOUhllCGGJVNY34bRr6lPINhNjyZw==}
     engines: {node: '>=8.12.0'}
 
+  i18next-browser-languagedetector@8.0.4:
+    resolution: {integrity: sha512-f3frU3pIxD50/Tz20zx9TD9HobKYg47fmAETb117GKGPrhwcSSPJDoCposXlVycVebQ9GQohC3Efbpq7/nnJ5w==}
+
+  i18next-fs-backend@2.6.0:
+    resolution: {integrity: sha512-3ZlhNoF9yxnM8pa8bWp5120/Ob6t4lVl1l/tbLmkml/ei3ud8IWySCHt2lrY5xWRlSU5D9IV2sm5bEbGuTqwTw==}
+
+  i18next-http-backend@3.0.2:
+    resolution: {integrity: sha512-PdlvPnvIp4E1sYi46Ik4tBYh/v/NbYfFFgTjkwFl0is8A18s7/bx9aXqsrOax9WUbeNS6mD2oix7Z0yGGf6m5g==}
+
+  i18next-http-middleware@3.7.1:
+    resolution: {integrity: sha512-nVTSGB1P4Gad5PFQYf3xVUOzJ4tVSQYD8Rs0luyWkjEMwqdqAcZ9CqIzqYwVLgB5/BKr1COI0oAei5dlYzmGbg==}
+
+  i18next@24.2.2:
+    resolution: {integrity: sha512-NE6i86lBCKRYZa5TaUDkU5S4HFgLIEJRLr3Whf2psgaxBleQ2LC1YW1Vc+SCgkAW7VEzndT6al6+CzegSUHcTQ==}
+    peerDependencies:
+      typescript: ^5
+    peerDependenciesMeta:
+      typescript:
+        optional: true
+
   ical-generator@1.15.4:
     resolution: {integrity: sha512-drXe4RLkfNlvDvdy/E6BUI9p+01L3ySK1ufNEYI9TxNKG9ZA3G60QWoZvD1dtmH4scwDxYu6/sZBPJvYVNrj8A==}
     engines: {node: '>=6.0.0'}
@@ -1601,6 +1668,15 @@ packages:
   niceware@3.0.0:
     resolution: {integrity: sha512-DbeDuqe836Ba4S9vjim4jTbbqmjCMwuAXFCVdh4QAvbmLOhmIQs84IakYrcXd/87VCsj1XKhSmmg7bAmwAEh5A==}
 
+  node-fetch@2.7.0:
+    resolution: {integrity: sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==}
+    engines: {node: 4.x || >=6.0.0}
+    peerDependencies:
+      encoding: ^0.1.0
+    peerDependenciesMeta:
+      encoding:
+        optional: true
+
   node-schedule@1.3.3:
     resolution: {integrity: sha512-uF9Ubn6luOPrcAYKfsXWimcJ1tPFtQ8I85wb4T3NgJQrXazEzojcFZVk46ZlLHby3eEJChgkV/0T689IsXh2Gw==}
 
@@ -1847,6 +1923,23 @@ packages:
     resolution: {integrity: sha512-8zGqypfENjCIqGhgXToC8aB2r7YrBX+AQAfIPs/Mlk+BtPTztOvTS01NRW/3Eh60J+a48lt8qsCzirQ6loCVfA==}
     engines: {node: '>= 0.8'}
 
+  react-i18next@15.4.1:
+    resolution: {integrity: sha512-ahGab+IaSgZmNPYXdV1n+OYky95TGpFwnKRflX/16dY04DsYYKHtVLjeny7sBSCREEcoMbAgSkFiGLF5g5Oofw==}
+    peerDependencies:
+      i18next: '>= 23.2.3'
+      react: '>= 16.8.0'
+      react-dom: '*'
+      react-native: '*'
+    peerDependenciesMeta:
+      react-dom:
+        optional: true
+      react-native:
+        optional: true
+
+  react@19.0.0:
+    resolution: {integrity: sha512-V8AVnmPIICiWpGfm6GLzCR/W5FXLchHop40W4nXBmdlEceh16rCN8O8LNWm5bh5XUX91fh7KpA+W0TgMKmgTpQ==}
+    engines: {node: '>=0.10.0'}
+
   readable-stream@2.3.8:
     resolution: {integrity: sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==}
 
@@ -2119,6 +2212,9 @@ packages:
     resolution: {integrity: sha512-Loo5UUvLD9ScZ6jh8beX1T6sO1w2/MpCRpEP7V280GKMVUQ0Jzar2U3UJPsrdbziLEMMhu3Ujnq//rhiFuIeag==}
     engines: {node: '>=6'}
 
+  tr46@0.0.3:
+    resolution: {integrity: sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==}
+
   tr46@4.1.1:
     resolution: {integrity: sha512-2lv/66T7e5yNyhAAC4NaKe5nVavzuGJQVVtRYLyQ2OI8tsJ61PMLlelehb0wi2Hx6+hT/OJUWZcw8MjlSRnxvw==}
     engines: {node: '>=14'}
@@ -2227,6 +2323,10 @@ packages:
     resolution: {integrity: sha512-ZZKSmDAEFOijERBLkmYfJ+vmk3w+7hOLYDNkRCuRuMJGEmqYNCNLyBBFwWKVMhfwaEF3WOd0Zlw86U/WC/+nYw==}
     engines: {'0': node >=0.6.0}
 
+  void-elements@3.1.0:
+    resolution: {integrity: sha512-Dhxzh5HZuiHQhbvTW9AMetFfBHDMYpo23Uo9btPXgdYP+3T5S+p+jgNy7spra+veYhBP2dCSgxR/i2Y02h5/6w==}
+    engines: {node: '>=0.10.0'}
+
   w3c-xmlserializer@4.0.0:
     resolution: {integrity: sha512-d+BFHzbiCx6zGfz0HyQ6Rg69w9k19nviJspaj4yNscGjrHu94sVP+aRm75yEbCh+r2/yR+7q6hux9LVtbuTGBw==}
     engines: {node: '>=14'}
@@ -2236,6 +2336,9 @@ packages:
     engines: {node: '>=12.0.0'}
     hasBin: true
 
+  webidl-conversions@3.0.1:
+    resolution: {integrity: sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==}
+
   webidl-conversions@7.0.0:
     resolution: {integrity: sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==}
     engines: {node: '>=12'}
@@ -2252,6 +2355,9 @@ packages:
     resolution: {integrity: sha512-Ed/LrqB8EPlGxjS+TrsXcpUond1mhccS3pchLhzSgPCnTimUCKj3IZE75pAs5m6heB2U2TMerKFUXheyHY+VDQ==}
     engines: {node: '>=14'}
 
+  whatwg-url@5.0.0:
+    resolution: {integrity: sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==}
+
   which@2.0.2:
     resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
     engines: {node: '>= 8'}
@@ -2325,6 +2431,10 @@ snapshots:
     dependencies:
       regenerator-runtime: 0.14.1
 
+  '@babel/runtime@7.26.9':
+    dependencies:
+      regenerator-runtime: 0.14.1
+
   '@colors/colors@1.5.0':
     optional: true
 
@@ -2717,6 +2827,10 @@ snapshots:
 
   '@types/http-errors@2.0.4': {}
 
+  '@types/i18next-fs-backend@1.2.0':
+    dependencies:
+      i18next-fs-backend: 2.6.0
+
   '@types/ical@0.8.3':
     dependencies:
       rrule: 2.6.4
@@ -3071,6 +3185,12 @@ snapshots:
       is-nan: 1.3.2
       moment-timezone: 0.5.45
 
+  cross-fetch@4.0.0:
+    dependencies:
+      node-fetch: 2.7.0
+    transitivePeerDependencies:
+      - encoding
+
   cross-spawn@7.0.3:
     dependencies:
       path-key: 3.1.1
@@ -3592,6 +3712,11 @@ snapshots:
 
   graphemer@1.4.0: {}
 
+  handlebars-i18next@1.0.3(handlebars@4.7.8)(i18next@24.2.2(typescript@5.4.5)):
+    dependencies:
+      handlebars: 4.7.8
+      i18next: 24.2.2(typescript@5.4.5)
+
   handlebars@4.7.8:
     dependencies:
       minimist: 1.2.8
@@ -3628,6 +3753,10 @@ snapshots:
     dependencies:
       whatwg-encoding: 2.0.0
 
+  html-parse-stringify@3.0.1:
+    dependencies:
+      void-elements: 3.1.0
+
   htmlparser2@8.0.2:
     dependencies:
       domelementtype: 2.3.0
@@ -3672,6 +3801,26 @@ snapshots:
 
   human-signals@1.1.1: {}
 
+  i18next-browser-languagedetector@8.0.4:
+    dependencies:
+      '@babel/runtime': 7.24.6
+
+  i18next-fs-backend@2.6.0: {}
+
+  i18next-http-backend@3.0.2:
+    dependencies:
+      cross-fetch: 4.0.0
+    transitivePeerDependencies:
+      - encoding
+
+  i18next-http-middleware@3.7.1: {}
+
+  i18next@24.2.2(typescript@5.4.5):
+    dependencies:
+      '@babel/runtime': 7.24.6
+    optionalDependencies:
+      typescript: 5.4.5
+
   ical-generator@1.15.4(@types/node@20.12.12):
     dependencies:
       '@types/node': 20.12.12
@@ -4045,6 +4194,10 @@ snapshots:
       binary-search: 1.3.6
       randombytes: 2.1.0
 
+  node-fetch@2.7.0:
+    dependencies:
+      whatwg-url: 5.0.0
+
   node-schedule@1.3.3:
     dependencies:
       cron-parser: 2.18.0
@@ -4251,6 +4404,15 @@ snapshots:
       iconv-lite: 0.4.24
       unpipe: 1.0.0
 
+  react-i18next@15.4.1(i18next@24.2.2(typescript@5.4.5))(react@19.0.0):
+    dependencies:
+      '@babel/runtime': 7.26.9
+      html-parse-stringify: 3.0.1
+      i18next: 24.2.2(typescript@5.4.5)
+      react: 19.0.0
+
+  react@19.0.0: {}
+
   readable-stream@2.3.8:
     dependencies:
       core-util-is: 1.0.3
@@ -4559,6 +4721,8 @@ snapshots:
       universalify: 0.2.0
       url-parse: 1.5.10
 
+  tr46@0.0.3: {}
+
   tr46@4.1.1:
     dependencies:
       punycode: 2.3.1
@@ -4640,6 +4804,8 @@ snapshots:
       core-util-is: 1.0.2
       extsprintf: 1.3.0
 
+  void-elements@3.1.0: {}
+
   w3c-xmlserializer@4.0.0:
     dependencies:
       xml-name-validator: 4.0.0
@@ -4654,6 +4820,8 @@ snapshots:
     transitivePeerDependencies:
       - debug
 
+  webidl-conversions@3.0.1: {}
+
   webidl-conversions@7.0.0: {}
 
   whatwg-encoding@2.0.0:
@@ -4667,6 +4835,11 @@ snapshots:
       tr46: 4.1.1
       webidl-conversions: 7.0.0
 
+  whatwg-url@5.0.0:
+    dependencies:
+      tr46: 0.0.3
+      webidl-conversions: 3.0.1
+
   which@2.0.2:
     dependencies:
       isexe: 2.0.0