taginfo’s relation/wiki_pages method no longer places results in a data property.
Also, only use relation/wiki_pages for top-level relation presets. More specific presets behave like non-relation presets. For example, the bicycle route relation has the tags type=route route=bicycle, so route=bicycle is what we’re interested in.
Fixes#3297.
* convert iD.Detect() iife to a module
* iD.Detect() should return loaded locale (except for 'en')
(The previous code was a hack to replace the detected locale with the loaded
locale. Now that Detect is a module, we can not replace the detected locale
from external code, but we can have Detect() return the locale we really want)
Minh Nguyễn