The button appears when a file is viewed in a branch or a tag. It points
to a URL containing the branch's (or tag's) current commit id so that
it'll always point to the same content.

- routers/admin: add rewrite update hook operation
- conf/locale: update locale file due to ini behavior changes
- cmd/cert_stub.go: remove useless code
- cmd/fix.go: no longer need fix command(at least now)