Aman Singh Ji,

Gurfateh

These are my personal views:

With Sikhism becoming global, it will have to adopt different languages especially English to spread Guru's message. In India for a very long period Hindi and Urdu have been used for this purpose so what is the problem if English and other languages are used? And right now are we not using English?

Even within families residing outside Punjab, the language of communication is often Hindi or English.

Dress has never been a problem. Men generally wear European dress along with a turban and beard neatly rolled up and pressed. They look pretty smart and women wear jeans, skirts, slacks or whatever even in Gurudwaras.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/new-to-sikhism/26118-dilemma-for-westerners-a-second-look.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=26118

The only problem appears to be Kesh and that too for men only because they need to be covered. Women do not cover their head in India other than in Gurudwaras or in presence of Granth Sahib as as a mark of respect. Turban and beard seem to be the only problem for men. Perhaps this problem also could be resolved with time.