Merge branch 'improve_settings_reusability' into 'develop'

changelog.d/adminfe.add

src/App.scss

src/components/checkbox/checkbox.vue

src/components/desktop_nav/desktop_nav.js

src/components/desktop_nav/desktop_nav.vue

...terface_language_switcher/interface_language_switcher.vue

src/components/media_upload/media_upload.js

src/components/media_upload/media_upload.vue

src/components/notification/notification.vue

src/components/popover/popover.js

src/components/popover/popover.vue

src/components/settings_modal/admin_tabs/frontends_tab.js

src/components/settings_modal/admin_tabs/frontends_tab.scss

src/components/settings_modal/admin_tabs/frontends_tab.vue

src/components/settings_modal/admin_tabs/instance_tab.js

src/components/settings_modal/admin_tabs/instance_tab.vue

src/components/settings_modal/admin_tabs/limits_tab.js

src/components/settings_modal/admin_tabs/limits_tab.vue

src/components/settings_modal/helpers/attachment_setting.js

src/components/settings_modal/helpers/attachment_setting.vue