review + fixes

src/components/mention_link/mention_link.vue

src/components/mentions_line/mentions_line.scss

src/components/rich_content/rich_content.jsx

src/components/settings_modal/tabs/theme_tab/theme_tab.js

src/components/status/status.js

src/components/status_body/status_body.scss

src/components/status_body/status_body.vue

src/services/entity_normalizer/entity_normalizer.service.js

test/unit/specs/components/rich_content.spec.js

...pecs/services/entity_normalizer/entity_normalizer.spec.js