chore(l10n): update Spanish translations

Currently translated at 100.0% (261 of 261 strings)

Translation: Fossify/Calendar
Translate-URL: https://hosted.weblate.org/projects/fossify/calendar/es/
Via: Weblate

Author: rcasl

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

@@ -272,4 +272,5 @@
     <string name="access_level_public">Público</string>
     <string name="access_level_confidential">Confidencial</string>
     <string name="allow_alarms_reminders">Debes permitir que la app programe alarmas para que los recordatorios funcionen correctamente.</string>
+    <string name="offline_never_synced">Fuera de línea (no sincronizado)</string>
 </resources>