pt-br: Partially translated files

[queengooborg]

While going through and formatting all files, I ran across the following files that are partially or fully untranslated. These files will probably needed to be resynchronized with upstream, or deleted.

• Learn/CSS/Building_blocks/Cascade_and_inheritance Updates "Learn/CSS/Building_blocks/Cascade_and_inheritance" content #14433
• Learn/CSS/Building_blocks/Selectors/Attribute_selectors Updates "Learn/CSS/Building_blocks/Selectors/Attribute_selectors" content #16013
• Learn/CSS/Building_blocks/The_box_model [pt-br] update Learn/CSS/Building_blocks/The_box_model page #16841
• Learn/CSS/CSS_layout/Introduction
• Learn/CSS/CSS_layout/Positioning
• Learn/CSS/CSS_layout/Responsive_Design
• Learn/Forms/Basic_native_form_controls
• Learn/Forms/How_to_build_custom_form_controls
• Learn/HTML/Multimedia_and_embedding/Adding_vector_graphics_to_the_Web
• Learn/JavaScript/Client-side_web_APIs/Client-side_storage
• Learn/JavaScript/Client-side_web_APIs/Introduction
• Learn/Server-side/Express_Nodejs/Displaying_data
• Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_getting_started
• Learn/Tools_and_testing/Cross_browser_testing/Introduction
• orphaned/MDN/Tools/KumaScript (Probably needs deletion) Chore/remove orphaned files #16582
• Web/API/Background_Tasks_API [pt-br][WIP] updates background task api content #14620
• Web/CSS/color_value
• Web/Events
• WebAssembly/Understanding_the_text_format [pt-br] updates webassembly text format content #14518
• WebAssembly/Using_the_JavaScript_API updates "WebAssembly/Using The Javascript API" #14434