BuddyPress.org

1.I want to translate English to Chinese, but I cannot find “Sitewide Activity” on domain/activity in the poedit profiles. Where can I edit it?
2.When I open the buddypress page,the title is as “Website NameActivity Streams Directory| ” “Website Nameadmin|Extended Profiles|”. How could I add “|” between website name and buddypress page names?
3.When I upload a new avatar, it will creat two images in wp-content/uploads/avatars/X(X is the ID).One is “XXXXXX_bpfull.jpg” and another is “XXXXXX_bpthumb.jpg”. You know that “get_avatar” code just transfer the “XXXXXX_bpthumb.jpg”, so the images are too small. Where and how can I edit it?
Thank you!