Use Osmose tiles API endpoint instead of issues

- Simplifies our code a little bit
- Quick to provide and gives us the `item` + `class` without requesting
all other information (the two things needed to know the error type)
- Removed handling of associated elements for now, need to implement
fetching for that data on a per-issue basis when the UI loads
- Set things up for the possibility of using the provided translation
strings (need to determine if desirable)

See: https://github.com/osm-fr/osmose-frontend/issues/193

data/qa_errors.json

@@ -34,7 +34,6 @@
             }
         },
         "osmose": {
-            "items": ["0", "1040", "1050", "1070", "1080", "1150", "1280"],
             "errorTypes": {
                 "0-1": {
                     "icon": "maki-home"