chore: Translate pressbooks-network-catalog.pot in zh

75% of minimum 25% translated source file: 'pressbooks-network-catalog.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-network-catalog-zh.po

@@ -171,7 +171,7 @@ msgstr "最近更新"
 
 #: resources/views/partials/refine-filters.blade.php:26
 msgid "Title (A-Z)"
-msgstr ""
+msgstr "标题（A-Z）"
 
 #: resources/views/partials/search-box.blade.php:8
 msgid "%d result for ‘%s’"