I’m not sure about the flow too but I think you need to approve the translations, then the language pack will be auto generated when the translation is done above 95%.
Nope, I translated using this:
https://translate.ww.wp.xz.cn/projects/wp-plugins/woo-advanced-shipment-tracking/dev/tr/default/
But I can download the po file from the extract button on the bottom if you need?
I found the problem and solution:
I used single quotes in my button text. In admin/class-mepu-woo-additional-fields.php line 80, the object is encoded without converting single quotes which breaks the HTML. So JSON_HEX_APOS constant should be passed to json_encode function as second parameter.
