Translations not working

Hi there

I have translated this plugin to 100% yet, the text still stay in English. When I look at the code, I notice the text-domain is written with a variable, which the handbook doesn’t recommend: https://developer.www.ads-software.com/plugins/internationalization/how-to-internationalize-your-plugin/

Now, I know of other plugins do it the way you do it… But I can’t see what goes wrong and why tools like Loco Translate doesn’t find any strings?

Could you take a look at this? Or am I overlooking something?

Thanks in advance!

Kind regards