diff --git a/js-build/config.js b/js-build/config.js
index d941bb1837..f1c5df4b64 100644
--- a/js-build/config.js
+++ b/js-build/config.js
@@ -129,8 +129,22 @@ const scssFiles = [
 	'chrome/skin/default/zotero/**/*.scss'
 ];
 
+const ftlFileBaseNames = [
+	'zotero',
+	'preferences',
+];
+
 const buildsURL = 'https://zotero-download.s3.amazonaws.com/ci/';
 
 module.exports = {
-	dirs, symlinkDirs, copyDirs, symlinkFiles, browserifyConfigs, jsFiles, scssFiles, ignoreMask, buildsURL
+	dirs,
+	symlinkDirs,
+	copyDirs,
+	symlinkFiles,
+	browserifyConfigs,
+	jsFiles,
+	scssFiles,
+	ignoreMask,
+	ftlFileBaseNames,
+	buildsURL,
 };
diff --git a/js-build/ftl-to-json.mjs b/js-build/ftl-to-json.mjs
index e2e06cfee4..c0326038a2 100644
--- a/js-build/ftl-to-json.mjs
+++ b/js-build/ftl-to-json.mjs
@@ -2,25 +2,29 @@ import { ftlToJSON } from "ftl-tx";
 import fs from 'fs-extra';
 import { dirname, join } from 'path';
 import { fileURLToPath } from 'url';
-import { onError, onSuccess } from './utils.js';
+import { ftlFileBaseNames as sourceFileBaseNames } from './config.js';
+import { onError, onProgress, onSuccess } from './utils.js';
 
 const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
 
 async function getJSON() {
 	const t1 = performance.now();
 	const sourceDir = join(ROOT, 'chrome', 'locale', 'en-US', 'zotero');
-	const sourceFile = join(sourceDir, 'zotero.ftl');
-	const destFile = join(sourceDir, 'zotero.json');
-	const ftl = await fs.readFile(sourceFile, 'utf8');
-	const json = ftlToJSON(ftl, { transformTerms: false, storeTermsInJSON: false });
-	await fs.outputJSON(destFile, json, { spaces: '\t' });
+	for (let sourceFileBaseName of sourceFileBaseNames) {
+		const sourceFile = join(sourceDir, sourceFileBaseName + '.ftl');
+		const destFile = join(sourceDir, sourceFileBaseName + '.json');
+		const ftl = await fs.readFile(sourceFile, 'utf8');
+		const json = ftlToJSON(ftl, { transformTerms: false, storeTermsInJSON: false });
+		await fs.outputJSON(destFile, json, { spaces: '\t' });
+		onProgress(destFile, destFile, 'json');
+	}
 	const t2 = performance.now();
-	return ({
-		action: 'ftl->json',
-		count: 1,
-		totalCount: 1,
-		processingTime: t2 - t1
-	});
+		return ({
+			action: 'ftl->json',
+			count: sourceFileBaseNames.length,
+			totalCount: sourceFileBaseNames.length,
+			processingTime: t2 - t1
+		});
 }
 
 if (process.argv[1] === fileURLToPath(import.meta.url)) {
diff --git a/js-build/localize-ftl.mjs b/js-build/localize-ftl.mjs
index 5185cb74cb..4f8e987f32 100644
--- a/js-build/localize-ftl.mjs
+++ b/js-build/localize-ftl.mjs
@@ -2,6 +2,7 @@ import { extractTerms, ftlToJSON, JSONToFtl } from 'ftl-tx';
 import fs from 'fs-extra';
 import { dirname, join } from 'path';
 import { fileURLToPath } from 'url';
+import { ftlFileBaseNames as sourceFileBaseNames } from './config.js';
 import { onError, onProgress, onSuccess } from './utils.js';
 import { exit } from 'process';
 
@@ -9,7 +10,6 @@ const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
 const localesDir = join(ROOT, 'chrome', 'locale');
 const sourceDir = join(localesDir, 'en-US', 'zotero');
 const termsSourceFTLPath = join(ROOT, 'app', 'assets', 'branding', 'locale', 'brand.ftl');
-const fallbackJSONPath = join(sourceDir, 'zotero.json');
 
 function getLocaleDir(locale) {
 	return join(localesDir, locale, 'zotero');
@@ -17,62 +17,66 @@ function getLocaleDir(locale) {
 
 async function getFTL() {
 	const t1 = performance.now();
-	if (!(await fs.pathExists(fallbackJSONPath))) {
-		console.error(`File ${fallbackJSONPath} does not exist -- please run 'ftl-to-json' first`);
-		exit(1);
-	}
-
+	
 	if (!(await fs.pathExists(termsSourceFTLPath))) {
 		console.error(`Required file ${termsSourceFTLPath} does not exist`);
 		exit(1);
 	}
-
-	const fallbackJSON = await fs.readJSON(fallbackJSONPath);
+	
 	const terms = extractTerms(await fs.readFile(termsSourceFTLPath, 'utf-8'));
-
+	
 	const foundLocales = (await fs.readdir(localesDir, { withFileTypes: true }))
 		.filter(dirent => dirent.isDirectory())
 		.map(dirent => dirent.name)
 		// Valid locale codes only
 		.filter(name => /^[a-z]{2}(-[A-Z]{2})?$/.test(name));
-
-	let locale;
+	
 	let count = 0;
-	while ((locale = foundLocales.pop())) {
-		// Skip source locale
-		if (locale == 'en-US') {
-			continue;
+	for (let sourceFileBaseName of sourceFileBaseNames) {
+		const fallbackJSONPath = join(sourceDir, sourceFileBaseName + '.json');
+		if (!(await fs.pathExists(fallbackJSONPath))) {
+			console.error(`File ${fallbackJSONPath} does not exist -- please run 'ftl-to-json' first`);
+			exit(1);
 		}
-
-		const ftlFilePath = join(getLocaleDir(locale), 'zotero.ftl');
-		let jsonFromLocalFTL = {};
-		try {
-			const ftl = await fs.readFile(ftlFilePath, 'utf8');
-			jsonFromLocalFTL = ftlToJSON(ftl, { transformTerms: false, storeTermsInJSON: false });
+		
+		const fallbackJSON = await fs.readJSON(fallbackJSONPath);
+		
+		for (let locale of foundLocales) {
+			// Skip source locale
+			if (locale == 'en-US') {
+				continue;
+			}
+			
+			const ftlFilePath = join(getLocaleDir(locale), sourceFileBaseName + '.ftl');
+			let jsonFromLocalFTL = {};
+			try {
+				const ftl = await fs.readFile(ftlFilePath, 'utf8');
+				jsonFromLocalFTL = ftlToJSON(ftl, { transformTerms: false, storeTermsInJSON: false });
+			}
+			catch (e) {
+				// no local .ftl file
+			}
+			
+			const jsonFilePath = join(getLocaleDir(locale), sourceFileBaseName + `.json`);
+			let jsonFromTransifex = {};
+			try {
+				const json = await fs.readJSON(jsonFilePath);
+				jsonFromTransifex = json;
+			}
+			catch (e) {
+				// no .json file from transifex
+			}
+			
+			const mergedJSON = { ...fallbackJSON, ...jsonFromLocalFTL, ...jsonFromTransifex };
+			const ftl = JSONToFtl(mergedJSON, { addTermsToFTL: false, storeTermsInJSON: false, transformTerms: false, terms });
+			
+			const outFtlPath = join(getLocaleDir(locale), sourceFileBaseName + '.ftl');
+			await fs.outputFile(outFtlPath, ftl);
+			onProgress(outFtlPath, outFtlPath, 'ftl');
+			count++;
 		}
-		catch (e) {
-			// no local .ftl file
-		}
-
-		const jsonFilePath = join(getLocaleDir(locale), `zotero.json`);
-		let jsonFromTransifex = {};
-		try {
-			const json = await fs.readJSON(jsonFilePath);
-			jsonFromTransifex = json;
-		}
-		catch (e) {
-			// no .json file from transifex
-		}
-
-		const mergedJSON = { ...fallbackJSON, ...jsonFromLocalFTL, ...jsonFromTransifex };
-		const ftl = JSONToFtl(mergedJSON, { addTermsToFTL: false, storeTermsInJSON: false, transformTerms: false, terms });
-
-		const outFtlPath = join(getLocaleDir(locale), 'zotero.ftl');
-		await fs.outputFile(outFtlPath, ftl);
-		onProgress(outFtlPath, outFtlPath, 'ftl');
-		count++;
 	}
-
+	
 	const t2 = performance.now();
 	return ({
 		action: 'ftl',