* Form: Emits error message on validate events

* Update form.md

* Tabs: fix order of TabNav when array is sorted

* update tabs.vue

* update test cases

Added Serbian translation.

Translate missing text

* Dialog: add opened event

* Docs: update es dialog doc

* Update dialog.md

* Form: adds prop to make asterisk optional on required  fields

* Form: adds prop to make asterisk optional on required  fields

* ElForm: Reverses attribute name to hide-required-asterisk, which defaults to false

* Update form-item.vue

* Update form.scss

* Update form.md

* update Spanish Doc

* update Spanish Doc

* update Spanish Doc

* Docs: Document el-form label-position attribute

Adds improved documentation to the el-form `label-position` attribute, which behaves differently when used with and without `label-width`. This has been a source of confusion for myself and others:

https://github.com/ElemeFE/element/issues/8477

Thanks!

* Document el-form label-position attribute (zh-CN, needs translation)

* Document el-form label-position attribute (es)

* Update form.md

* Select: use initial height to reset height of input

* Update select.vue

* Updated el-form-item to accept custom error message via slot

* FormItem: updated slot name in docs

* updated spanish and chinese translations

* Update form.md

* Update form.md

* Update form.md

* Update form.md

* Upload: create blob URL when picture displays

* Update index.vue

Current link is https://element.eleme.io/nuxtjs.org instead of https://nuxtjs.org/.

* fix #12513

* fix: fallback for autoComplete and print deprecated warning

* fix: fix auto-complete property in select component

* fix default complete value

* Docs: Update document for autocomplete property change

* Docs: remove redundant documents

* remove unnecessary console log message\

* Update select.md

* fix: add missing declaration in select.d.ts

选中submenu下的菜单，submenu没有激活样式式象错误

Makes it possible to style the height of ".el-time-spinner__item". 
Removed the fixed values associated to a height and line-height: 32px. It's now possible to set whichever height a user wants and the scrollbar will adjust itself accordingly.

watch.value will keep firing during time picker selection
it now detects whether panel is closed before firing el.form.change

* date-picker: refactor type='dates'

fix issue #12323
{month, year} table highlights all selected dates
nuke selectedDates to provide cleaner data flow

* doc: correct date-picker's array usage

empty value must be falsy (empty array should not be used)