Localize numbers, units in scale, info panels

[1ec5]

Numbers and units appear unlocalized throughout iD. This PR begins to localize some of them. Here are some before-and-afters:

Scale bar:

• Depending on the browser language, a period will group the thousands digits and a comma will serve as the decimal separator.
• In Chinese, the unit symbol would be translated as 公里.

Coordinate in search results:

• Coordinates appear in the familiar degree-minute-second format to clarify that latitudes are displayed before longitudes.

Measurement panel, seen here in metric with a closed area selected:

• “Closed” will appear after “area” or “line” in some locales.
• The English localization abbreviates square feet and square miles as “sq ft” and “sq mi”, respectively, instead of “ft²” and “mi²”.
• Lengths and areas are rounded to four significant figures instead of a fixed decimal place.

Location panel:

• Coordinates appear in both degree-minute-second and decimal format, for better precision and easier copy-pasting.

 
Measurement panel partially localized into Persian

Fixes #3597.

[bhousel]

I played around with this today and it looks great - sorry it took me a few weeks to get to it!