action_system.md: some updates for "Localizing Actions and Groups"
action_system.md: some updates for "Localizing Actions and Groups"

artspb/intellij-sdk-docs,artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs,artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs,artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs