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

77% of minimum 25% translated source file: 'pressbooks-network-catalog.pot'
on 'tr_TR'.

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-tr_TR.po

@@ -117,7 +117,7 @@ msgstr ""
 
 #: resources/views/components/selectable-filter.blade.php:48
 msgid "Show more +"
-msgstr ""
+msgstr "Show more +"
 
 #: resources/views/partials/book-card.blade.php:3
 msgid "%s book cover"