You can change the language in the program preferences in the following way:

In Video Suite, select gear icon and choose your language from dropdown list:

In Movavi Video Editor Plus, select main menu Settings- Preferences (used to be Edit - Preferences):

In Movavi Screen Recorder select main menu Preferences - Language:

In Movavi Video Converter Premium, select main menu Settings - Language (used to be Settings- Preferences):

In Movavi Picverse select main menu Settings - Language:

In Mac program select Movavi Mac program main menu - Language, or Preferences - Language: