chore(mergify): file condition (#3427)

Author: greg-in-a-box

.mergify.yml

@@ -10,7 +10,7 @@ pull_request_rules:
       conditions:
           - author=boxmoji
           - base=master
-          - files~=^[a-z]{2}-[A-Z]{2}\.properties$
+          - files="i18n/*"
           - status-success="Validate"
           - status-success=license/cla
           - status-success=lint_test_build