Consider internationalisation #18
Description
This is a follow-up of #8.
I don't know, whether you want to support other languages than English.
For example, Czech.
If you want to do that at some point in the future, consider adopting a library like i18next early on to save you some hassles down the line.
Oh, and while you are at it, adding a lang attribute to <html> could ease crawlers the job on interpreting the spoken languages used in the UI.