lightBg -> highlight because it causes issues with v2

src/components/style_switcher/style_switcher.vue

src/i18n/en.json

src/services/theme_data/theme_data.service.js

static/themes/breezy-dark.json

static/themes/breezy-light.json

static/themes/redmond-xx-se.json

static/themes/redmond-xx.json

static/themes/redmond-xxi.json