Upgrading from 2.5 to 3.3. How to?

Hey everyone. I need to move existed site from J2.5 to J3.3 with all content. Is it so easy as just connecting old sql to J3.3?

Please read carefully this site:
https://docs.joomla.org/Joomla_3_FAQ
While updating you will have to download J3.x version of the template and install it.
You also might replace some plugins that worked with 2.x with those which 3.x support.

Thank you. I understand that I need to use J3.x version of the template but I'm worried about template and modules settings. They need to be re-configured or settings will be saved? How to to keep settings of all site?

It might be required to reconfigure some settings again.
I would strongly suggest to create a working backup of the site (files and db) and if any problems occurs - use it as a guide on setting up new template/plugins.
Also - after the update, please let us know if it went well and if you had any problems.

Thank you, I will. But we've decided to move 2.5 version to another hosting at first cause we have no enough time to solve possible problems. And after that start to work under 3.x version.

Ok, please let me know if you would have any additional questions regarding this topic.

http://c2n.me/393sLO1
Polish? How to switch into Russian?

Could you please post an url to your site where this issue can be seen?

http://nkfmgei.ru/

What exactly should I click to see this behave?

Oh, sorry. http://nkfmgei.ru/index.php/novosti/ite ... ravosudiya, http://nkfmgei.ru/index.php/novosti/ite ... rzhat-10-1, http://nkfmgei.ru/index.php/novosti/ite ... seminar-1s or any other article. Social buttons are in the bottom of each article. http://clip2net.com/s/393sLO1

The buttons are completely fine - in Russian language. Have you been able to fix that on your own?