data: Update cldr2json script to new format

We want to extend the data model with additional keys, actions,
and properties. We need keys to be a map instead of a plain array
of strings.

Adapt the script to dump data in this new format, so it generates
a decent base to manually complete the work.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>

data/cldr2json/cldr2json.py

@@ -79,7 +79,7 @@ def parse_rows(keymap):
                        reverse=True):
         row = []
         for key in sorted(v, key=lambda x: x):
-            row.append(key[1])
+            row.append({ 'strings': key[1] })
         rows.append(row)
 
     return rows