Most architect firms are international. for example snøhytta. Which is very well known in world. So yes English is their language but they will not hire until you speak good Norwegian. Reason is simple as architecture is not just sitting and drafting, you need customer orientation that need Norwegian.
It is extremely challenging to get job in Architecture or any design or media firm. Reason is lot of company do not want to hire them full time, instead they choose consultants. If you land up in job salary for Architect is not less than 120k in dollors per year.