updated contrib scripts to use darktable translation facilities

contrib/geoJSON_export.lua

@@ -35,7 +35,7 @@ USAGE
 local dt = require "darktable"
 local du = require "lib/dtutils"
 local df = require "lib/dtutils.file"
-local gettext = dt.gettext
+local gettext = dt.gettext.gettext
 
 du.check_min_api_version("7.0.0", "geoJSON_export") 
 
@@ -48,11 +48,8 @@ script_data.destroy_method = nil -- set to hide for libs since we can't destroy
 script_data.restart = nil -- how to restart the (lib) script after it's been hidden - i.e. make it visible again
 script_data.show = nil -- only required for libs since the destroy_method only hides them
 
--- Tell gettext where to find the .mo file translating messages for a particular domain
-gettext.bindtextdomain("geoJSON_export",dt.configuration.config_dir.."/lua/locale/")
-
 local function _(msgid)
-    return gettext.dgettext("geoJSON_export", msgid)
+    return gettext(msgid)
 end
 
 -- Sort a table