get_text("reversegeocode/result") returns an XML node. We want to get the text value...

get_text("reversegeocode/result") returns an XML node.  We want to get the text value of that node.

This will unescape ' into an apostrophe.

All callers of this function will later re-encode it depending out output whether it be HTML in an email, or XML in an RSS feed.

* app/mailers/user_mail.rb
* app/helpers/geocode_helper.rb
* app/views/api/notes/feed.rss.builder
* app/views/api/notes/_note.rss.builder

Fixes openstreetmap/openstreetmap-website#3761