Suggestions and Problems

Hi Amir,
Please read my answers below:

1- Improve the design and switch to material design

Still working on this. Release not in this month.

2- Show who is online or not (maybe from ultimate member)

This is out of our to-do list. We’ll think about it.

3- Able to tag other users in comments

We’re preparing User and Comment referring Addon for near updates.

4- Add google transliteration support
https://ww.wp.xz.cn/plugins/google-transliteration/

This should be done for whole page, there are dozens of plugin for that. If you want comment translation button you should check wpDiscuz Comment Translation addon, it based on Yandex.Translat, because Google is not Free for custom area translations (only for whole web page).
http://wpdiscuz.com/addons/wpdiscuz-comment-translation-demo/
http://gvectors.com/product/wpdiscuz-report-flagging/

5- Make ability to pin the comments
http://codecanyon.net/item/comment-pinner/12235131

Still working on this. Release is not in this month.

6- make a button near comment box and when users click on that they can read “commenting rules” which admin wrote in backed

This out of our to-do. We’ll think about that.

7- Users able to see the names of users who rate their comments

This and other good features will be available as addon very soon.

Problems:
1 -Style of thumbs down is not correct. The counter is very close to it. http://i.imgur.com/PRpDQ8T.png
This is a RTL issue, please try this CSS:

#wpcomm .wc-comment-footer .wc-vote-result.wc-vote-result-dislike {
    margin-left: 0px;
    margin-right: 7px;
}

2- How to remove hover effect of thumbs (The text appears in tooltip), it isn’t necessary, everyone knows the meaning of thumbs up and down.

I have no clue for this, there is no any option yet.

3- Make the thumbs colorful, red and green and when user vote, turn off the color for the other option. For example before voting, thumbs are green and red. After voting up, the voting up button remains green and thumbs down button turns to gray. Now the user can know easily which comments he voted before.

Still working on this. Release is not in this month.