Only show comparison link for >2 commits #1110

We can look at the PushCommits object to see how many commits were
included in a commit, and add some template logic to only show the
comparison link when there are at least 2 commits in a push. We also
correct the link to display the number of commits.

conf/locale/locale_en-US.ini

@@ -1021,7 +1021,7 @@ comment_issue = `commented on issue <a href="%s/issues/%s">%s#%[2]s</a>`
 merge_pull_request = `merged pull request <a href="%s/pulls/%s">%s#%[2]s</a>`
 transfer_repo = transfered repository <code>%s</code> to <a href="%s">%s</a>
 push_tag = pushed tag <a href="%s/src/%s">%[2]s</a> to <a href="%[1]s">%[3]s</a>
-compare_2_commits = View comparison for these 2 commits
+compare_commits = View comparison for these %d commits
 
 [tool]
 ago = ago