[weblate] add dummy string to trigger weblate.push.translations in CI

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/searxng.msg

@@ -36,6 +36,7 @@ CATEGORY_NAMES = {
     'MAP': 'map',
     'ONIONS': 'onions',
     'SCIENCE': 'science',
+    'DUMMY': 'dummy',
 }
 
 CATEGORY_GROUPS = {