remove most of reply preview and autoload related stuff

src/components/mobile_nav/mobile_nav.js

src/components/settings_modal/tabs/general_tab.vue

src/components/timeline/timeline.js

src/i18n/ar.json

src/i18n/ca.json

src/i18n/cs.json

src/i18n/de.json

src/i18n/en.json

src/i18n/eo.json

src/i18n/es.json

src/i18n/et.json

src/i18n/eu.json

src/i18n/fi.json

src/i18n/fr.json

src/i18n/ga.json

src/i18n/he.json

src/i18n/hu.json

src/i18n/it.json

src/i18n/ja_easy.json

src/i18n/ja_pedantic.json