Docs: update custom-theme docs

* Created Armenian locale

* Added Armenian locale in example docs

* Created Armenian locale in example docs

* Created Armenian locale in example docs

* Update hy-AM.js

* Table: fix params order of row events (#12086)

* Timeline: add timeline component (#11736)

* Timeline: add timeline component

* Timeline: add timeline component

* Timeline: add test case

* Timeline: fix icon class

* Timeline: update docs

* Timeline: fix test case

* Timeline: remove pending attribute

* Timeline: fix docs

* Timeline: make reverse default to false

* Timline: fix test case

* Timeline: update element-ui.d.ts

* Timeline: optimize code

* docs(datetime-picker): fix zh-CN format

* docs(datetime-picker): update es doc error

Docs: Changelog for 2.5.4

CollapseTransition: Fix bug when build commonjs with babel

* changelog for 2.5.3

* update

* update name

Tabs: fix error tab bar style

Build: Fix UMD bundle error used in node env

Webpack UMD modules are broken currently: [webpack/webpack#6525](https://github.com/webpack/webpack/issues/6525)

Docs: add v2.5.2 changelog

Build: fix export error fired in commonjs module used in nuxt.js

Build: delete unremoved comments in umd module `lib/index.js`

fixed #14230

Update ChangeLog ES 2.5.1

chore: 2.5.1 fix

chore: add 2.5.1 changelog

docs: keep 2.4.11 docs && new sub folder for 2.5+

chore: update 2.5.0 changelog