Hi Adri,
Thank you for bringing this request to us.
To translate the Show Comment Form, you need to translate the theme. We wrote an article about that: Translating Your Theme.
Concerning the url, unfortunately we have no clue. As this issue is related with BuddyPress, it’s best if you try to reach the plugin authors. They will be more informed and better suited to help you.
To go further, we invite you to post your request on their support forums: buddypress.org/support
We remain available for all support requests related with the use of your theme.
Best,