fix(alarms): name a pause's last day, and switch on an alarm given a date

"Paused, back on" named the day after the pause, which for a weekday
alarm can be a Saturday it never rings on. A pause under way now reads
"Paused through Wed, Oct 28".

Picking a date on a switched-off alarm switches it on, the pause picker
cannot confirm a range that is already over, a spent pause stored with
its ends reversed is cleared too, and the widget formats its date in the
app's own locale.

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

@@ -122,8 +122,8 @@
     <string name="alarm_scheduled_for">Scheduled for %1$s</string>
     <!-- %1$s is a date range such as "Oct 26 – 28" -->
     <string name="alarm_paused_dates">Paused %1$s</string>
-    <!-- %1$s is the first date the alarm rings again, such as "Thu, Oct 29": the pause has already begun -->
-    <string name="alarm_paused_back_on">Paused, back on %1$s</string>
+    <!-- %1$s is the pause's last day, such as "Wed, Oct 28", which is itself still paused: the pause has already begun -->
+    <string name="alarm_paused_through">Paused through %1$s</string>
     <string name="alarm_summary_separator" translatable="false">" \u00b7 "</string>
 
     <!-- M5: the alarm editor -->