Fix few markup inconsistencies

changelog.d/markup-panels.fix

src/boot/after_store.js

src/components/chat_list/chat_list.vue

src/components/drafts/drafts.vue

src/components/features_panel/features_panel.vue

...ponents/mrf_transparency_panel/mrf_transparency_panel.vue

src/components/registration/registration.js

src/components/registration/registration.vue

src/components/staff_panel/staff_panel.vue

...mponents/terms_of_service_panel/terms_of_service_panel.js

...ponents/terms_of_service_panel/terms_of_service_panel.vue

src/components/user_card/user_card.vue

src/i18n/en.json

src/modules/instance.js