Update translation files

Updated by "Remove blank strings" hook in Weblate.

Co-authored-by: Hosted Weblate <hosted@weblate.org>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/
Translation: Kotatsu/Strings

app/src/main/res/values-it/strings.xml

@@ -710,7 +710,6 @@
     <string name="demographic_seinen">Seinen</string>
     <string name="source_code">Codice sorgente</string>
     <string name="start_download">Inizia download</string>
-    <string name="content_type_artist_cg"></string>
     <string name="user_manual">Manuale utente</string>
     <string name="telegram_group">Gruppo Telegram</string>
     <string name="screen_orientation">Orientamento schermo</string>