User upgrades issues and questions

[Moshe1010]

1. I encounter this message through Firefox 21.0 (only) after a payment is submitted:



The payment worked, and the user was upgraded. Chrome doesn't show this message nor Safari.


2. Let's say a user has a subscription for 30 days. After 15 days in his/her subscription the user decides to upgrade to another month, so overall he/she has 45 days left. Is this possible?

3. How do I redirect a user to a thread after his/her purchase? Is this possible only with this add-on?
http://xenforo.com/community/resources/advanced-user-upgrades.639/updates

4. Is there a way to force PayPal to use a certain language in its checkout? (A language that is available in Paypal's interface).

Thanks.

 

[Paul B]

1. That appears to be a browser related issue.

2. No. It has been suggested.

3. Yes, requires an add-on.

4. That would be a question for PayPal.

 

[Moshe1010]

1. That appears to be a browser related issue.

2. No. It has been suggested.

3. Yes, requires an add-on.

4. That would be a question for PayPal.

Paypal just gives you the code, they don't say where to put it. As this reply suggested:
http://xenforo.com/community/threads/account-upgrades-how-to-set-pay-pal-language-to-english.24277/

This is the code that PayPal gives you if you ask, but editing this template at the location he/she said doesn't work anymore.
Any ideas where can I add this line?