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_es-ES.ini

@@ -1018,7 +1018,7 @@ comment_issue=`comentó en la incidencia <a href="%s/issues/%s">%s#%[2]s</a>`
 merge_pull_request=`fusionado pull request <a href="%s/pulls/%s">%s#%[2]s</a>`
 transfer_repo=transfirió el repositorio <code>%s</code> a <a href="%s">%s</a>
 push_tag=hizo push del tag <a href="%s/src/%s">%[2]s</a> a <a href="%[1]s">%[3]s</a>
-compare_2_commits=Ver la comparación de estos 2 commits
+compare_commits=Ver la comparación de estos %d commits
 
 [tool]
 ago=hace