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

81% 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

@@ -341,7 +341,7 @@ msgstr "允许的机构管理员"
 
 #: resources/views/institutions/form.blade.php:188
 msgid "Enter username or email to find existing user(s). Limit 3."
-msgstr "输入用户名或电子邮件以查找现有用户。限制 3。"
+msgstr "输入用户名或电子邮件以查找现有用户。最多3人。"
 
 #: resources/views/institutions/form.blade.php:237
 msgid "Premium Member Buy-in"