TunnelEditor: fix nits

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/res/layout/tunnel_editor_fragment.xml

@@ -218,12 +218,13 @@
 
                         <Button
                             style="@style/Widget.AppCompat.Button.Borderless.Colored"
+                            android:id="@+id/set_excluded_applications"
                             android:layout_width="wrap_content"
                             android:layout_height="wrap_content"
                             android:layout_marginLeft="-8dp"
                             android:layout_below="@+id/dns_servers_text"
                             android:onClick="@{fragment::onRequestSetExcludedApplications}"
-                            android:text="@{fragment.excludedApplications().length == 0 ? @string/set_excluded_applications : String.format(@string/x_excluded_applications, fragment.excludedApplications().length)}" />
+                            android:text="@{@plurals/set_excluded_applications(config.interfaceSection.excludedApplicationsCount, config.interfaceSection.excludedApplicationsCount)}" />
                     </RelativeLayout>
                 </android.support.v7.widget.CardView>
 

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

@@ -69,7 +69,10 @@
     <string name="restore_on_boot_summary">Bring up previously-enabled tunnels on boot</string>
     <string name="restore_on_boot_title">Restore on boot</string>
     <string name="save">Save</string>
-    <string name="set_excluded_applications">Set Excluded Applications</string>
+    <plurals name="set_excluded_applications">
+        <item quantity="one">%d Excluded Application</item>
+        <item quantity="other">%d Excluded Applications</item>
+    </plurals>
     <string name="set_exclusions">Set Exclusions</string>
     <string name="settings">Settings</string>
     <string name="toggle_error">Error toggling WireGuard tunnel: %s</string>