Merge link in action menu broken

[b1rger]

The merge link was fixed in 0088fc6 by @gythaogg , but this fix was reverted in e01f3f4 during a refactoring. The merge link should point to object.get_merge_view_url instead of object.get_merge_url.

[b1rger]

Due to the fact that this is rather urgent, I'm assigning this to me