Add route to get available languages

src/cloudron.js

@@ -5,6 +5,7 @@ exports = module.exports = {
     uninitialize,
     getConfig,
     getLogs,
+    getLanguages,
 
     reboot,
     isRebootRequired,
@@ -279,6 +280,12 @@ function getLogs(unit, options, callback) {
     return callback(null, transformStream);
 }
 
+function getLanguages(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
+    callback(null, ['en', 'de', 'fr', 'it']);
+}
+
 function prepareDashboardDomain(domain, auditSource, callback) {
     assert.strictEqual(typeof domain, 'string');
     assert.strictEqual(typeof auditSource, 'object');