Add accept language header to all requests

Author: abelgardep

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudClient.java

@@ -43,6 +43,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;
+import java.util.Locale;
 
 import static com.owncloud.android.lib.common.http.HttpConstants.AUTHORIZATION_HEADER;
 import static com.owncloud.android.lib.common.http.HttpConstants.HTTP_MOVED_PERMANENTLY;
@@ -128,6 +129,7 @@ private int saveExecuteHttpMethod(HttpBaseMethod method) throws Exception {
             Timber.d("Executing in request with id %s", requestId);
             method.setRequestHeader(HttpConstants.OC_X_REQUEST_ID, requestId);
             method.setRequestHeader(HttpConstants.USER_AGENT_HEADER, SingleSessionManager.getUserAgent());
+            method.setRequestHeader(HttpConstants.ACCEPT_LANGUAGE_HEADER, Locale.getDefault().getLanguage());
             method.setRequestHeader(HttpConstants.ACCEPT_ENCODING_HEADER, HttpConstants.ACCEPT_ENCODING_IDENTITY);
             if (mCredentials.getHeaderAuth() != null && !mCredentials.getHeaderAuth().isEmpty()) {
                 method.setRequestHeader(AUTHORIZATION_HEADER, mCredentials.getHeaderAuth());

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/HttpConstants.java

@@ -40,6 +40,7 @@ public class HttpConstants {
     public static final String IF_MATCH_HEADER = "If-Match";
     public static final String IF_NONE_MATCH_HEADER = "If-None-Match";
     public static final String CONTENT_TYPE_HEADER = "Content-Type";
+    public static final String ACCEPT_LANGUAGE_HEADER = "Accept-Language";
     public static final String CONTENT_LENGTH_HEADER = "Content-Length";
     public static final String OC_TOTAL_LENGTH_HEADER = "OC-Total-Length";
     public static final String OC_X_OC_MTIME_HEADER = "X-OC-Mtime";