enhanced translation handling by ensuring source language inclusion and exposing German defaults for untranslated keys

common.php

@@ -888,13 +888,30 @@ function qdb_build_app_translations_map(PDO $pdo): array {
     $translations = qdb_load_translations_for_entries($pdo, $entries);
     $defaults = qdb_app_string_catalog()['germanDefaults'] ?? [];
     $result = [];
+
+    qdb_ensure_source_language($pdo);
+    $languageCodes = $pdo->query('SELECT languageCode FROM language ORDER BY languageCode')
+        ->fetchAll(PDO::FETCH_COLUMN);
+    if (!in_array(QDB_SOURCE_LANGUAGE, $languageCodes, true)) {
+        $languageCodes[] = QDB_SOURCE_LANGUAGE;
+    }
+
     foreach ($entries as $e) {
         $key = $e['key'];
         foreach ($translations[$e['entityId']] ?? [] as $lang => $text) {
-            $result[$lang][$key] = $text;
+            if ($text !== '') {
+                $result[$lang][$key] = $text;
+            }
         }
-        if (!isset($result[QDB_SOURCE_LANGUAGE][$key]) && !empty($defaults[$key])) {
+        $defaultDe = trim($defaults[$key] ?? '');
-            $result[QDB_SOURCE_LANGUAGE][$key] = $defaults[$key];
+        if ($defaultDe === '') {
+            continue;
+        }
+        // New catalog keys: expose German default for every language until translated on the website.
+        foreach ($languageCodes as $lc) {
+            if (empty($result[$lc][$key] ?? '')) {
+                $result[$lc][$key] = $defaultDe;
+            }
         }
     }
     return $result;