chore(docs): adding lang field for markdowns (#4005)

- Add lang field for all *.md files' frontmatters

docs/en-US/component/affix.md

@@ -1,3 +1,7 @@
+---
+lang: en-US
+---
+
 # Affix
 
 Fix the element to a specific visible area.

docs/en-US/component/alert.md

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+---
+lang: en-US
+---
+
 # Alert
 
 Displays important alert messages.

docs/en-US/component/avatar.md

@@ -1,3 +1,7 @@
+---
+lang: en-US
+---
+
 # Avatar
 
 Avatars can be used to represent people or objects. It supports images, Icons, or characters.

docs/en-US/component/backtop.md

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+---
+lang: en-US
+---
+
 # Backtop
 
 A button to back to top

docs/en-US/component/badge.md

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+---
+lang: en-US
+---
+
 # Badge
 
 A number or status mark on buttons and icons.

docs/en-US/component/border.md

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+---
+lang: en-US
+---
+
 # Border
 
 We standardize the borders that can be used in buttons, cards, pop-ups and other components.

docs/en-US/component/breadcrumb.md

@@ -1,3 +1,7 @@
+---
+lang: en-US
+---
+
 # Breadcrumb
 
 Displays the location of the current page, making it easier to browser back.

docs/en-US/component/button.md

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+---
+lang: en-US
+---
+
 # Button
 
 Commonly used button.

docs/en-US/component/calendar.md

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+---
+lang: en-US
+---
+
 # Calendar
 
 Display date.

docs/en-US/component/card.md

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+---
+lang: en-US
+---
+
 # Card
 
 Integrate information in a card container.

docs/en-US/component/carousel.md

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+---
+lang: en-US
+---
+
 # Carousel
 
 Loop a series of images or texts in a limited space

docs/en-US/component/cascader.md

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+---
+lang: en-US
+---
+
 # Cascader
 
 If the options have a clear hierarchical structure, Cascader can be used to view and select them.

docs/en-US/component/checkbox.md

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+---
+lang: en-US
+---
+
 # Checkbox
 
 A group of options for multiple choices.

docs/en-US/component/collapse.md

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+---
+lang: en-US
+---
+
 # Collapse
 
 Use Collapse to store contents.

docs/en-US/component/color-picker.md

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+---
+lang: en-US
+---
+
 # ColorPicker
 
 ColorPicker is a color selector supporting multiple color formats.

docs/en-US/component/color.md

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+---
+lang: en-US
+---
+
 # Color
 
 Element Plus uses a specific set of palettes to specify colors to provide a consistent look and feel for the products you build.

docs/en-US/component/config-provider.md

@@ -1,6 +1,6 @@
 ---
 title: Config Provider
-locale: en-US
+lang: en-US
 ---
 
 # Config Provider

docs/en-US/component/container.md

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+---
+lang: en-US
+---
+
 # Container
 
 Container components for scaffolding basic structure of the page:

docs/en-US/component/date-picker.md

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+---
+lang: en-US
+---
+
 # DatePicker
 
 Use Date Picker for date input.

docs/en-US/component/datetime-picker.md

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+---
+lang: en-US
+---
+
 # DateTimePicker
 
 Select date and time in one picker.

docs/en-US/component/descriptions.md

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+---
+lang: en-US
+---
+
 # Descriptions
 
 Display multiple fields in list form.

docs/en-US/component/dialog.md

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+---
+lang: en-US
+---
+
 # Dialog
 
 Informs users while preserving the current page state.

docs/en-US/component/divider.md

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+---
+lang: en-US
+---
+
 # Divider
 
 The dividing line that separates the content.

docs/en-US/component/drawer.md

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+---
+lang: en-US
+---
+
 # Drawer
 
 Sometimes, `Dialog` does not always satisfy our requirements, let's say you have a massive form, or you need space to display something like `terms & conditions`, `Drawer` has almost identical API with `Dialog`, but it introduces different user experience.

docs/en-US/component/dropdown.md

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+---
+lang: en-US
+---
+
 # Dropdown
 
 Toggleable menu for displaying lists of links and actions.

docs/en-US/component/empty.md

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-## Empty
+---
+lang: en-US
+---
+
+# Empty
 
 Placeholder hints for empty states.
 

docs/en-US/component/form.md

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+---
+lang: en-US
+---
+
 # Form
 
 Form consists of `input`, `radio`, `select`, `checkbox` and so on. With form, you can collect, verify and submit data.

docs/en-US/component/icon.md

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+---
+lang: en-US
+---
+
 # Icon
 
 Element Plus provides a set of common icons.

docs/en-US/component/image.md

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+---
+lang: en-US
+---
+
 # Image
 
 Besides the native features of img, support lazy load, custom placeholder and load failure, etc.

docs/en-US/component/infinite-scroll.md

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+---
+lang: en-US
+---
+
 # Infinite Scroll
 
 Load more data while reach bottom of the page

docs/en-US/component/input-number.md

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+---
+lang: en-US
+---
+
 # Input Number
 
 Input numerical values with a customizable range.

docs/en-US/component/input.md

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-# Input
+---
+lang: en-US
+---
+
+# Input
 
 Input data using mouse or keyboard.
 

docs/en-US/component/layout.md

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+---
+lang: en-US
+---
+
 # Layout
 
 Quickly and easily create layouts with the basic 24-column.

docs/en-US/component/link.md

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+---
+lang: en-US
+---
+
 # Link
 
 Text hyperlink

docs/en-US/component/loading.md

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+---
+lang: en-US
+---
+
 # Loading
 
 Show animation while loading data.

docs/en-US/component/menu.md

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+---
+lang: en-US
+---
+
 # Menu
 
 Menu that provides navigation for your website.

docs/en-US/component/message-box.md

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+---
+lang: en-US
+---
+
 # Message Box
 
 A set of modal boxes simulating system message box, mainly for alerting information, confirm operations and prompting messages.

docs/en-US/component/message.md

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+---
+lang: en-US
+---
+
 # Message
 
 Used to show feedback after an activity. The difference with Notification is that the latter is often used to show a system level passive notification.

docs/en-US/component/notification.md

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+---
+lang: en-US
+---
+
 # Notification
 
 Displays a global notification message at a corner of the page.

docs/en-US/component/page-header.md

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+---
+lang: en-US
+---
+
 # Page Header
 
 If path of the page is simple, it is recommended to use PageHeader instead of the Breadcrumb.

docs/en-US/component/pagination.md

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+---
+lang: en-US
+---
+
 # Pagination
 
 If you have too much data to display in one page, use pagination.

docs/en-US/component/popconfirm.md

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+---
+lang: en-US
+---
+
 # Popconfirm
 
 A simple confirmation dialog of an element click action.

docs/en-US/component/popover.md

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+---
+lang: en-US
+---
+
 # Popover
 
 ## Basic usage

docs/en-US/component/progress.md

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+---
+lang: en-US
+---
+
 # Progress
 
 Progress is used to show the progress of current operation, and inform the user the current status.

docs/en-US/component/radio.md

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-## Radio
+---
+lang: en-US
+---
+
+# Radio
 
 Single selection among multiple options.
 

docs/en-US/component/rate.md

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+---
+lang: en-US
+---
+
 # Rate
 
 Used for rating

docs/en-US/component/result.md

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+---
+lang: en-US
+---
+
 # Result
 
 Used to give feedback on the result of user's operation or access exception.

docs/en-US/component/scrollbar.md

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+---
+lang: en-US
+---
+
 # Scrollbar
 
 Used to replace the browser's native scrollbar.

docs/en-US/component/select-v2.md

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+---
+lang: en-US
+---
+
 # <ElBadge value="beta">Select V2 virtualized selector</ElBadge>
 
 :::tip

docs/en-US/component/select.md

@@ -1,3 +1,7 @@
+---
+lang: en-US
+---
+
 # Select
 
 When there are plenty of options, use a drop-down menu to display and select desired ones.

docs/en-US/component/skeleton.md

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+---
+lang: en-US
+---
+
 # Skeleton
 
 When loading data, and you need a rich experience for visual and interactions for your end users, you can choose `skeleton`.

docs/en-US/component/slider.md

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+---
+lang: en-US
+---
+
 # Slider
 
 Drag the slider within a fixed range.

docs/en-US/component/space.md

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+---
+lang: en-US
+---
+
 # Space
 
 Even though we have [Divider](/en-US/component/divider), but sometimes we need more than one [Divider](/en-US/component/divider) to split the elements apart, so we stack each elements upon [Divider](/en-US/component/divider), but doing so not only makes our code ugly but also makes it difficult to maintain. **Space** is this kind of component provides us both productivity and elegance.

docs/en-US/component/steps.md

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+---
+lang: en-US
+---
+
 # Steps
 
 Guide the user to complete tasks in accordance with the process. Its steps can be set according to the actual application scenario and the number of the steps can't be less than 2.

docs/en-US/component/switch.md

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+---
+lang: en-US
+---
+
 # Switch
 
 Switch is used for switching between two opposing states.

docs/en-US/component/table.md

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+---
+lang: en-US
+---
+
 # Table
 
 Display multiple data with similar format. You can sort, filter, compare your data in a table.

docs/en-US/component/tabs.md

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+---
+lang: en-US
+---
+
 # Tabs
 
 Divide data collections which are related yet belong to different types.

docs/en-US/component/tag.md

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+---
+lang: en-US
+---
+
 # Tag
 
 Used for marking and selection.

docs/en-US/component/time-picker.md

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+---
+lang: en-US
+---
+
 # TimePicker
 
 Use Time Picker for time input.

docs/en-US/component/time-select.md

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+---
+lang: en-US
+---
+
 # TimeSelect
 
 Use Time Select for time input.

docs/en-US/component/timeline.md

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+---
+lang: en-US
+---
+
 # Timeline
 
 Visually display timeline.

docs/en-US/component/tooltip.md

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+---
+lang: en-US
+---
+
 # Tooltip
 
 Display prompt information for mouse hover.

docs/en-US/component/transfer.md

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+---
+lang: en-US
+---
+
 # Transfer
 
 ## Customizable

docs/en-US/component/tree-v2.md

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+---
+lang: en-US
+---
+
 # <ElBadge value="beta">Tree V2 virtualized tree</ElBadge>
 
 Tree view with blazing fast scrolling performance for any amount of data

docs/en-US/component/tree.md

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+---
+lang: en-US
+---
+
 # Tree
 
 Display a set of data with hierarchies.

docs/en-US/component/typography.md

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-## Typography
+---
+lang: en-US
+---
+
+# Typography
 
 We create a font convention to ensure the best presentation across different platforms.
 

docs/en-US/component/upload.md

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+---
+lang: en-US
+---
+
 # Upload
 
 Upload files by clicking or drag-and-drop

docs/en-US/guide/changelog.md

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 ---
 title: 'Changelog'
+lang: en-US
 ---
 
 <style scoped lang="scss">

docs/en-US/guide/design.md

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 ---
 title: Design
+lang: en-US
 ---
 
 <style scoped lang="scss">

docs/en-US/guide/i18n.md

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 ---
 title: Internationalization
+lang: en-US
 ---
 
 # Internationalization

docs/en-US/guide/installation.md

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 ---
 title: Installation
+lang: en-US
 ---
 
 # Installation

docs/en-US/guide/migration.md

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 ---
 title: Migration
+lang: en-US
 ---
 
 # Migration

docs/en-US/guide/nav.md

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 ---
 title: Navigation
+lang: en-US
 ---
 
 <style scoped lang="scss">

docs/en-US/guide/quickstart.md

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 ---
 title: Quick Start
+lang: en-US
 ---
 
 # Quick Start

docs/en-US/guide/theming.md

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 ---
 title: Theming
+lang: en-US
 ---
 
 # Custom theme

docs/en-US/guide/transitions.md

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 ---
 title: Built-in Transitions
+lang: en-US
 ---
 
 # Built-in Transition

docs/en-US/index.md

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 ---
 title: A Desktop UI Toolkit for Web
 page: true
+lang: en-US
 ---
 
 <ClientOnly>

docs/en-US/resource/index.md

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 ---
 page: true
+lang: en-US
 ---
 
 <script setup lang="ts">