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>

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.gingercal"
-    android:versionCode="6"
-    android:versionName="1.5">
+    android:versionCode="7"
+    android:versionName="1.6">
 
     <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="10" />