Add merged commit id on pull view when it's merged (#8062)

Author: lunny

options/locale/locale_en-US.ini

@@ -971,6 +971,7 @@ pulls.tab_files = Files Changed
 pulls.reopen_to_merge = Please reopen this pull request to perform a merge.
 pulls.cant_reopen_deleted_branch = This pull request cannot be reopened because the branch was deleted.
 pulls.merged = Merged
+pulls.merged_as = The pull request has been merged as <a rel="nofollow" class="ui sha" href="%[1]s"><code>%[2]s</code></a>.
 pulls.has_merged = The pull request has been merged.
 pulls.title_wip_desc = `<a href="#">Start the title with <strong>%s</strong></a> to prevent the pull request from being merged accidentally.`
 pulls.cannot_merge_work_in_progress = This pull request is marked as a work in progress. Remove the <strong>%s</strong> prefix from the title when it's ready

templates/repo/issue/view_content/pull.tmpl

@@ -49,7 +49,12 @@
 		<div class="ui {{if not $.LatestCommitStatus}}top attached header{{else}}attached merge-section segment{{end}}">
 			{{if .Issue.PullRequest.HasMerged}}
 				<div class="item text purple">
-					{{$.i18n.Tr "repo.pulls.has_merged"}}
+					{{if .Issue.PullRequest.MergedCommitID}}
+						{{$link := printf "%s/commit/%s" $.Repository.HTMLURL .Issue.PullRequest.MergedCommitID}}
+						{{$.i18n.Tr "repo.pulls.merged_as" $link (ShortSha .Issue.PullRequest.MergedCommitID) | Safe}}
+					{{else}}
+						{{$.i18n.Tr "repo.pulls.has_merged"}}
+					{{end}}
 				</div>
 				{{if .IsPullBranchDeletable}}
 					<div class="ui divider"></div>