(CE-610) Add translations for CloseMyAccount

Adds translations to CloseMyAccount extension for de, es, fr, it, ja,
pl, pt, ru, zh-hans, and zh-tw.
(CE-610) Fix formatting of translations

Fix links to point to correct language help wikias and change translated
special page links to the English ones so they will work on any language
wikia.
Merge branch 'CE-610-i18n' into dev
ADEN-850 Remove wgAdDriverUseGptMobile* and clean up
ADEN-850 Rename ad_slots2 to ads_run, wikiamobile_ads_gpt_js to wikiamobile_ads_js
ADEN-850 Add a note about DartUrl and WikiaDartHelper