Add JavaLocationUtils and factory

onionwrapper-java/src/main/java/org/briarproject/onionwrapper/JavaLocationUtils.java

+package org.briarproject.onionwrapper;
+
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.Locale;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+@NotNullByDefault
+class JavaLocationUtils implements LocationUtils {
+
+    private static final Logger LOG =
+            Logger.getLogger(JavaLocationUtils.class.getName());
+
+    @Inject
+    JavaLocationUtils() {
+    }
+
+    @Override
+    public String getCurrentCountry() {
+        LOG.info("Using user-defined locale");
+        return Locale.getDefault().getCountry();
+    }
+
+}

onionwrapper-java/src/main/java/org/briarproject/onionwrapper/JavaLocationUtilsFactory.java

+package org.briarproject.onionwrapper;
+
+public class JavaLocationUtilsFactory {
+
+    public static JavaLocationUtils createJavaLocationUtils() {
+        return new JavaLocationUtils();
+    }
+
+}