I have installed 4.1.14136 version and now I'm fully disappointed
How might I return English interface?
Why my sequences do not work?! I see strange Pithon window instead of old good sequences one.
How to move menu buttons? Top panel became too broad for my screen.
did you upgrade from quite an old version? Nothing that you mention is really new (it has all probably been in SharpCap for 2 or more years...)
Anyway, recent versions will give you a UI to match your Windows language selection if a translation is present. You can disable that in the settings - main Settings window, General tab, 'Display' section, top checkbox then restart. Actually there was a previous bug where SharpCap was using the language settings for time/date/number format from your computer rather than the windows UI language, so perhaps you updated from a version that had that bug, causing the change in behaviour.
The sequencer is different to the scripting (separate top level menu items), so you will still be able to run/edit/use your sequences from the 'Sequencer' menu.
The toolbar buttons are all supposed to fit in the width of a 1280 wide display at 100% font scaling, although that gets more difficult to maintain as new features are added. You can't resize or re-order those, but the extra that don't fit are shown under a little drop down arrow on the right. Maybe the change in language made things wider, causing the buttons not to fit properly?
And all buttons are on the screen 
Thank you again for the advices.