escape parentesese in OverpassAPI links

... to make links easier to use in the command line
fix broken legacy {{nominatimArea/Id}} shortcuts in xml mode

fixes #107
update some translations
upgrade osmtogeojson to version 2.2.1

(bugfix for ref-less, cropped full geometry ways)
do not show (incorrect) backlog stats if result doesn't contain timestamp
update osmtogeojson (including golf-key for polygon-feature detection)
update translations
update icon sets
update preset translations
update changelog
Merge branch 'master' into gh-pages