* Color: fix demo-color-box in docs respnsive layout

* Update color.md

* Update color.md

* Update color.md

* Select: Preserves focus after options selected

* Select: softFocus: Passing lint
Write test

* Select: Soft focus: Include input ref

* Revert src/index.js

* Update select.vue

* docs: update quickstart demo, close #9883

* docs: fix typo

* date-picker: fix date-time panel user input

* test: add test for date-time-picker change event

* Update de.js

* Update de.js

Hello from Greece to element-ui community. Just change confirm from "ok" to "Εντάξει". More correct Greek word for "ok". Also attempts for
* PrevYear, 
* nextYear, 
* prevMonth, 
* nextMonth. 
*deleteTip,
sumText,
Titles-Lists,
filterPlaceholder,
noCheckedFormat,
Just direct translation, not tested on components yet. Any comment or recommendation accepted.....
by the way, keep up the good work, and im lover of dark themes............