repo: able to fork own repository (#1791)

conf/locale/locale_en-US.ini

@@ -398,7 +398,6 @@ migrate.failed = Migration failed: %v
 
 mirror_from = mirror of
 forked_from = forked from
-fork_from_self = You cannot fork a repository you already own!
 copy_link = Copy
 copy_link_success = Copied!
 copy_link_error = Press ⌘-C or Ctrl-C to copy

templates/repo/header.tmpl

@@ -32,7 +32,7 @@
 						</div>
 						{{if .CanBeForked}}
 							<div class="ui labeled button" tabindex="0">
-								<a class="ui button {{if eq .OwnerID $.SignedUserID}}poping up{{end}}" {{if not (eq .OwnerID $.SignedUserID)}}href="{{AppSubUrl}}/repo/fork/{{.ID}}"{{else}} data-content="{{$.i18n.Tr "repo.fork_from_self"}}" data-position="top center" data-variation="tiny"{{end}}>
+								<a class="ui button {{if eq .OwnerID $.SignedUserID}}poping up{{end}}" href="{{AppSubUrl}}/repo/fork/{{.ID}}">
 									<i class="octicon octicon-repo-forked"></i>{{$.i18n.Tr "repo.fork"}}
 								</a>
 								<a class="ui basic label" href="{{.Link}}/forks">