feature: add global size option (#1024)

src/components/LangSelect/index.vue

src/components/SizeSelect/index.vue

src/icons/svg/size.svg

src/lang/en.js

src/lang/zh.js

src/main.js

src/router/index.js

src/store/getters.js

src/store/modules/app.js

src/views/layout/components/Navbar.vue

src/views/redirect/index.vue