How about add language english for ui

[yurenchen000]

And an option in navigation-drawer

[TransparentLC]

This can be added, but it will take a while for me to extract and translate the strings...

[yurenchen000]

Maybe I can deal with it.
// i'm new to VUE

How about this #57

• Add language option in navigation-drawer
• Add language auto detect (follow browser setting
• Add vue-i18n and locales .json

• without auto change (seems no language change event
• without index.html, manifest.json translate
• some msg ret by server may not translated