fixing the issue of translating the non english language data

Author: sadafk831

android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java

@@ -514,11 +514,13 @@ private void done(Response resp) {
                             String utf8 = new String(b);
                             callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_UTF8, utf8);
                         }
-                        // This usually mean the data is contains invalid unicode characters, it's
-                        // binary data
+                        // This usually mean the data is contains invalid unicode characters but still valid data,
+                        // it's binary data, so send it as a normal string
                         catch(CharacterCodingException ignored) {
+                            
                             if(responseFormat == ResponseFormat.UTF8) {
-                                callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_UTF8, "");
+                                String utf8 = new String(b);
+                                callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_UTF8, utf8);
                             }
                             else {
                                 callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_BASE64, android.util.Base64.encodeToString(b, Base64.NO_WRAP));