In Islam, you can say "Mabrook" to offer congratulations.
Yes, people of the religion Islam can say "say" or speak any number of other languages they might be inclined to learn to speak just as anyone else may.
Technically speaking all the Prophets (May peace be upon them) preached Islam. However, in the present perspective one may say that the last Prophet of Islam Hazrat Muhammad (May peace and blessings of Allah Karim be upon him) revived Islam.
A lot of people say Islam. But that may not be right..
How did the Beduins help expand Islam
Islam is not a language.
Islam is a faith not a language.
Islam has no opinion on football.
"how may I help you?"
yes but you would say can I help you too someone you know and may i help you would to a stranger or an adult
how may I help you = wie kann/darf ich Ihnen helfen?
It is not against Islam to say 'pig'. Eating pig is sinful in Islam.