1. OK : on = about
2. No - it should be
in the week of...- on is used with a specific day or date : On Tuesday; on December 1st
- in is used with a period of time : in the next two weeks, in August, in 1975
3. Why
would? It's not hypothetical but a prediction related to a definite requirement - so
will.
4.
English and Colony doesn't make sense. I'm not sure what is meant because of not knowing the context, but maybe one of :
Britain and its colonies / Britain and colonisation / The use of English in British colonies