chore(l10n): update Portuguese (Brazil) translations

Currently translated at 100.0% (111 of 111 strings)

Translation: Fossify/Messages
Translate-URL: https://hosted.weblate.org/projects/fossify/sms-messenger/pt_BR/
Via: Weblate

Author: Tekhnikal

app/src/main/res/values-pt-rBR/strings.xml

@@ -122,4 +122,5 @@
     <string name="keywords">Palavras-chave</string>
     <string name="export_blocked_keywords">Exportar palavras-chave bloqueadas</string>
     <string name="import_blocked_keywords">Importar palavras-chave bloqueadas</string>
+    <string name="keep_conversations_archived">Manter conversas arquivadas</string>
 </resources>