feat: add localization input for location form

[escapedcat]

Describe the solution you'd like

https://btcmap.org/add-location

Current form only takes default values. For certain value we should offer to input localized version i.e.

• name

For name default field is local and we offer a second input for the "English" name

Additional context

The website can be translated already but the data itself relies on default (en) fields

[b0rgbart3]

I’d like to work on this. To confirm: should the form add an optional English name field and submit it as name:en,
│ while keeping name as the local/default name?

[escapedcat]

Yes, exactly

[b0rgbart3]

My PR:
#1064