This will make adding a new translation a bit easier (this change
also accepts full codes for language variations like en-UK or pt-BR)

Also specify a full code for English and Chinese translations (Chinese
variation was found with a translation tool's language detector so
it might not be accurate)

This removes all of the boilerplate for setting strings (now the
strings are set by looping through an object and calling a helper function)

The helper function also has an English string fallback if a translation
doesn't have one

And finally some functions/.html code were adjusted to simplify the localization
helper function (this also means innerHTML is no longer used for safety)

There's some strings coming from the Rust side though (which
will require extra code work)

This may be strange in some places though