Implement further features for badges.

* Add Subscriptions API
* Add Accept-Language header to profile requests
* Fix several UI bugs, add error dialogs, etc.

app/src/main/java/org/thoughtcrime/securesms/service/SubscriberIdKeepAliveListener.java

@@ -0,0 +1,39 @@
+package org.thoughtcrime.securesms.service;
+
+import android.content.Context;
+import android.content.Intent;
+
+import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
+import org.thoughtcrime.securesms.jobs.SubscriptionKeepAliveJob;
+import org.thoughtcrime.securesms.keyvalue.SignalStore;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Manages the scheduling of jobs for keeping a subscription id alive.
+ */
+public class SubscriberIdKeepAliveListener extends PersistentAlarmManagerListener {
+
+  private static final long INTERVAL = TimeUnit.DAYS.toMillis(3);
+
+  @Override
+  protected long getNextScheduledExecutionTime(Context context) {
+    return SignalStore.donationsValues().getLastKeepAliveLaunchTime() + INTERVAL;
+  }
+
+  @Override
+  protected long onAlarm(Context context, long scheduledTime) {
+    if (SignalStore.donationsValues().getSubscriber() != null) {
+      ApplicationDependencies.getJobManager().add(new SubscriptionKeepAliveJob());
+    }
+
+    long now = System.currentTimeMillis();
+    SignalStore.donationsValues().setLastKeepAliveLaunchTime(now);
+
+    return now + INTERVAL;
+  }
+
+  public static void schedule(Context context) {
+    new SubscriberIdKeepAliveListener().onReceive(context, new Intent());
+  }
+}