feat: Add Kids Mode toggle to Settings View

Description

This MR adds a "Kids Mode" toggle to the VLC-iOS settings.

Changes Made

• Added a new SettingsItem of type .toggle to the main settings section.
• Defined the kVLCSettingEnableKidsMode constant in VLCConstants.h.
• Added English and Brazilian Portuguese translations for the toggle text in Root.strings.

Notes

• The toggle does not currently affect app behavior, as the "Kids Mode" logic is yet to be implemented.
• Now I plan to ask for the password when I try to delete a video from the media gallery. I'am still thinking on what to do to implement this