chore(l10n): update Spanish (American) translations

Currently translated at 4.5% (12 of 261 strings)

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

Author: Anónimo

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

@@ -7,4 +7,9 @@
     <string name="monthly_view">Vista mensual</string>
     <string name="monthly_daily_view">Vista mensual y diaria</string>
     <string name="yearly_view">Vista anual</string>
+    <string name="simple_event_list">Lista de eventos simple</string>
+    <string name="no_upcoming_events">No hay eventos próximos.</string>
+    <string name="go_to_today">Ir a hoy</string>
+    <string name="go_to_date">Ir a la fecha</string>
+    <string name="widget_monthly">Calendario mensual</string>
 </resources>