Calendar Lite 1.6: English month and weekday names in English mode

They came from the phone's locale, so a phone set to Spanish showed "Octubre 2026" with an
English interface (and I18nTest failed on any machine not set to English).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/org/gingercal/GingerApp.java

@@ -9,7 +9,7 @@ public class GingerApp extends Application {
         super.onCreate();
         L.gl = !"en".equals(getSharedPreferences("gingercal", 0).getString("lang", "gl"));
         org.gingercal.net.CertVerifier.setRootStore(new org.gingercal.net.AssetRoots(this));
-        org.gingercal.net.Http.USER_AGENT = "CalendarLite/1.5 (Android 2.3)";
+        org.gingercal.net.Http.USER_AGENT = "CalendarLite/1.6 (Android 2.3)";
         tlsTexts();
     }