integrating WIP-languages (#24683)

* integrating WIP-languages

* handle malformed, but "correct" empty i18n files

---------

Co-authored-by: Tom De Moor <tom@controlaltdieliet.be>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

tools/mmgotool/commands/i18n.go

@@ -681,6 +681,11 @@ func clean(translationDir string, file string, dryRun bool, check bool) (*string
 		return nil, err
 	}
 
+	if strings.TrimSpace(string(oldJSON)) == "{}" {
+		noIssue := ""
+		return &noIssue, err
+	}
+
 	var oldList []Item
 	if err = json.Unmarshal(oldJSON, &oldList); err != nil {
 		return nil, err