[تم الحل] Want to translate text i insert inside php file

Background of the issue:
I am trying to translate text that I inserted inside a PHP file on my WordPress site using WPML. The specific text I want to translate is 'Binnen 1-2 werkdagen' into English and German. The site I need help with is الرابط المخفي, and the specific page is الرابط المخفي. I am unable to translate this text using the current setup.

Symptoms:
The text 'Binnen 1-2 werkdagen' inside a PHP file is not translating to English and German.

Questions:
How can I translate text inside a PHP file using WPML?
Is there a specific method to translate hardcoded text in PHP files with WPML?