Fix storybook language addon (#31880)

It was not working for languages like de_DE which were normalised to de in one codepath but not the other

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

packages/shared-components/.storybook/main.ts

@@ -13,7 +13,18 @@ import { dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 
 // Get a list of available languages so the language selector can display them at runtime
-const languages = fs.readdirSync("src/i18n/strings").map((f) => f.slice(0, -5));
+const languageFiles = fs.readdirSync("src/i18n/strings").map((f) => f.slice(0, -5));
+
+const languages: Record<string, string> = {};
+for (const lang of languageFiles) {
+    const normalizedLanguage = lang.toLowerCase().replace("_", "-");
+    const languageParts = normalizedLanguage.split("-");
+    if (languageParts.length === 2 && languageParts[0] === languageParts[1]) {
+        languages[languageParts[0]] = `${lang}.json`;
+    } else {
+        languages[normalizedLanguage] = `${lang}.json`;
+    }
+}
 
 /**
  * This function is used to resolve the absolute path of a package.
@@ -50,19 +61,8 @@ const config: StorybookConfig = {
                         server.middlewares.use((req, res, next) => {
                             if (req.url === "/i18n/languages.json") {
                                 // Dynamically generate a languages.json file based on what files are available
-                                const langJson: Record<string, string> = {};
-                                for (const lang of languages) {
-                                    const normalizedLanguage = lang.toLowerCase().replace("_", "-");
-                                    const languageParts = normalizedLanguage.split("-");
-                                    if (languageParts.length === 2 && languageParts[0] === languageParts[1]) {
-                                        langJson[languageParts[0]] = `${lang}.json`;
-                                    } else {
-                                        langJson[normalizedLanguage] = `${lang}.json`;
-                                    }
-                                }
-
                                 res.setHeader("Content-Type", "application/json");
-                                res.end(JSON.stringify(langJson));
+                                res.end(JSON.stringify(languages));
                             } else if (req.url?.startsWith("/i18n/")) {
                                 // Serve the individual language files, which annoyingly can't be a simple
                                 // static dir because the directory structure in src doesn't match what
@@ -90,7 +90,7 @@ const config: StorybookConfig = {
     },
     env: (config) => ({
         ...config,
-        STORYBOOK_LANGUAGES: JSON.stringify(languages),
+        STORYBOOK_LANGUAGES: JSON.stringify(Object.keys(languages)),
     }),
 };
 export default config;