Add hints about migrate options on migration page

Author: lunny

options/locale/locale_en-US.ini

@@ -614,6 +614,7 @@ migrate.permission_denied = You are not allowed to import local repositories.
 migrate.invalid_local_path = "The local path is invalid. It does not exist or is not a directory."
 migrate.failed = Migration failed: %v
 migrate.lfs_mirror_unsupported = Mirroring LFS objects is not supported - use 'git lfs fetch --all' and 'git lfs push --all' instead.
+migrate.migrate_items_options = When you are migrating from github and inputed username, the migration options will be display.
 
 mirror_from = mirror of
 forked_from = forked from

templates/repo/migrate.tmpl

@@ -14,6 +14,7 @@
 						<input id="clone_addr" name="clone_addr" value="{{.clone_addr}}" autofocus required>
 						<span class="help">
 						{{.i18n.Tr "repo.migrate.clone_address_desc"}}{{if .ContextUser.CanImportLocal}} {{.i18n.Tr "repo.migrate.clone_local_path"}}{{end}}
+						<br/>{{.i18n.Tr "repo.migrate.migrate_items_options"}}
 						{{if .LFSActive}}<br/>{{.i18n.Tr "repo.migrate.lfs_mirror_unsupported"}}{{end}}
 						</span>
 					</div>