yes
No, it is not a Forever Stamp.
The caligraphy lettering is very stylized, but I belive it says Eid Mubaraak ( عيد موبراك ), the most common greeting for Eid al-Fitr, the conclusion of Ramadan - it means "Happy Eid"!
I don't see any writing on the flag. The lower right of the stamp has the year in small numbers, but there is nothing on the flag itself.
It will say forever on the stamp. If it doesn't, it may be one of the non-denominational issues that has a fixed price. See the link below.
It is a forever stamp. It is good for the current value of a first class stamp.
A first-class stamp is not the same as a forever stamp. A forever stamp holds the value of a first-class stamp regardless of how often the rate for first-class postage has increased. A first-class stamp only holds its face value.
Yes. that is their purpose, to still be valid.
Yes, you can use a Forever stamp on a postcard, but it's overpaying for postage.
Yes, you can ... forever ...
seex
Yes