Dear Ahmed,
The English language available are:
English - English United Kingdom
English - English United States
English - Middle Latin
English (Old) English, Old
English (Deseret)
You can check the available languages here Supported Languages in Unicode SAP Systems
Check too sapnote 73606 - Supported Languages and Code Pages
You can check the procedure for the installation here Installation of Languages on SAP systems
Hope this helps.
Best regards,
Martina