Add edit status functionality

CONTRIBUTORS.md

src/App.js

src/App.vue

src/components/edit_status_modal/edit_status_modal.js

src/components/edit_status_modal/edit_status_modal.vue

src/components/extra_buttons/extra_buttons.js

src/components/extra_buttons/extra_buttons.vue

src/components/post_status_form/post_status_form.js

src/components/post_status_form/post_status_form.vue

src/i18n/en.json

src/main.js

src/modules/api.js

src/modules/editStatus.js

src/modules/statuses.js

src/services/api/api.service.js

src/services/entity_normalizer/entity_normalizer.service.js

src/services/status_poster/status_poster.service.js