change the curl user agent because nominatim.org blocks it

osm-search/Nominatim#2929 (comment)

gen_osml10n_extension.sh

@@ -20,7 +20,7 @@ done
 if ! [ -f "country_osm_grid.sql" ]; then
   rm -f country_osm_grid.sql
   echo -n "Trying to download country_grid.sql.gz from nominatim.org... "
-  curl -sL https://www.nominatim.org/data/country_grid.sql.gz |gzip -d >country_osm_grid.sql
+  curl -A "dpkg build for mapnik-german-l10n deb file" -sL https://www.nominatim.org/data/country_grid.sql.gz |gzip -d >country_osm_grid.sql
 
   if ! [ -s country_osm_grid.sql ]; then
     rm -f country_osm_grid.sql