chore: Translate pressbooks-multi-institution.pot in zh

63% of minimum 25% translated source file: 'pressbooks-multi-institution.pot'
on 'zh'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

languages/pressbooks-multi-institution-zh.po

@@ -281,7 +281,7 @@ msgstr "访问网络首页"
 
 #: resources/views/dashboard/institutional.blade.php:17
 msgid "%s has %s books and %s users. "
-msgstr ""
+msgstr "%s有%s本书和%s个用户。"
 
 #: resources/views/dashboard/institutional.blade.php:24
 msgid "Administer"