nextcloud: tweak configs key

basic/overrides/stackspin-nextcloud-override.yaml

@@ -17,6 +17,17 @@ data:
             #'defaultapp' => 'dashboard,files',
             #'default_language' => 'en',
           );
+      nextcloud:
+        configs:
+          defaults.config.php: |-
+            <?php
+            $CONFIG = array (
+              'allow_user_to_change_display_name' => false,
+              'default_phone_region' => 'DE',
+              'default_locale' => 'de',
+              #'defaultapp' => 'dashboard,files',
+              #'default_language' => 'en',
+            );
     apps:
       # Basics
       - name: password_policy