Feat/add customizations

[pavlushkin]

1. Disable language switcher

Motivation:

For projects that use only one language the language switch element in a side bar is redundant.

Desired appearance:

Solution:

Add enableLocaleSwitcher boolean param to SidebarBottom

Usage example:

<SidebarBottom
    collapsed={collapsed}
    toggleCollapsed={() => setCollapsed((v) => !v)}
    enableLocaleSwitcher={false}
/>

2. Pass autoSave props

<QuestionnaireResponseForm
    // ...                                
    autoSave={true}
/>