fix: preserve language query when opening docs

* fix: forward editor lang through open redirect

* docs: add NOTE on expected ISO 639-1 lang codes in open endpoint

* test: add spawn timeout and simplify non-ASCII test paths

---------

Co-authored-by: Codex Agent <codex@openinterpreter.com>

Author: cs50victor

__tests__/generate-office-fonts-path.test.js

@@ -72,6 +72,7 @@ function runGenerator({ fontDataDir, writeOutputs }) {
   return spawnSync('node', [SCRIPT_PATH], {
     env,
     encoding: 'utf8',
+    timeout: 10000,
   });
 }
 
@@ -89,7 +90,7 @@ afterEach(() => {
 describe('generate_office_fonts path handling', () => {
   test('should succeed when FONT_DATA_DIR contains non-ASCII characters', () => {
     const root = makeTempDir('oo-editors-fontdata-');
-    const fontDataDir = path.join(root, 'C', 'Users', 'دانيال', 'AppData', 'Roaming', 'interpreter', 'office-extension-fontdata');
+    const fontDataDir = path.join(root, 'دانيال', 'fontdata');
 
     const result = runGenerator({ fontDataDir, writeOutputs: true });
 
@@ -100,7 +101,7 @@ describe('generate_office_fonts path handling', () => {
 
   test('should fail when generator exits 0 but does not write metadata files', () => {
     const root = makeTempDir('oo-editors-fontdata-');
-    const fontDataDir = path.join(root, 'C', 'Users', 'دانيال', 'AppData', 'Roaming', 'interpreter', 'office-extension-fontdata');
+    const fontDataDir = path.join(root, 'دانيال', 'fontdata');
 
     const result = runGenerator({ fontDataDir, writeOutputs: false });
 

server.js

@@ -862,6 +862,8 @@ app.get('/load/:filename', (req, res) => {
 // ONLY supports absolute paths via query parameter
 app.get('/open', (req, res) => {
   const filepath = req.query.filepath;
+  // NOTE(victor): OnlyOffice expects ISO 639-1 codes (e.g. "es", "fr"), not full names like "spanish"
+  const lang = typeof req.query.lang === 'string' ? req.query.lang : '';
 
   if (!filepath) {
     return res.status(400).json({ error: 'filepath query parameter is required' });
@@ -884,7 +886,18 @@ app.get('/open', (req, res) => {
   console.log(`[OPEN] Document URL: ${documentUrl}`);
 
   // Redirect to offline loader with parameters
-  res.redirect(`/offline-loader-proper.html?url=${encodeURIComponent(documentUrl)}&title=${encodeURIComponent(filename)}&filepath=${encodeURIComponent(filepath)}&filetype=${ext}&doctype=${docType}`);
+  const redirectParams = new URLSearchParams({
+    url: documentUrl,
+    title: filename,
+    filepath: String(filepath),
+    filetype: ext,
+    doctype: docType,
+  });
+  if (lang) {
+    redirectParams.set('lang', lang);
+  }
+
+  res.redirect(`/offline-loader-proper.html?${redirectParams.toString()}`);
 });
 
 // API Endpoint: Serve raw/original file (not converted)