Language: Remove deprecated initEncoding(), recodeForEdit() & recodeInput()
Language::initEncoding(), ::recodeForEdit(), and ::recodeInput() deprecated in
1.28 are now removed.
Usage
=====
* initEncoding() -
https://codesearch.wmflabs.org/search/?q=initEncoding&i=nope&files=&repos=
* recodeForEdit() -
https://codesearch.wmflabs.org/search/?q=recodeForEdit&i=nope&files=&repos=
* recodeInput() -
https://codesearch.wmflabs.org/search/?q=recodeInput&i=nope&files=&repos=
Bug: T220656
Change-Id: I309ec5eebbdddd3b71541c446b15b15204abf8ca