Carol Gullidge Dec 8, 2018:

rayonnement can also mean reputation, influence, charisma (Robert dictionary) -and not necessarily any connection with shining!

Tony M Dec 8, 2018:

@ Asker: Context? I guess it also depends on the overall context: what sort of business is this? To what extent / in what way has their international presence evolved over the last year?
I understand 'rayonnement' with the general sense of 'sphere of influence' — in this case, a 'rayon' of activity seems an entirely appropriate image.

Carol Gullidge Dec 8, 2018:

@ Asker I actually think you come closer to the mark with "recognition"; or along these same lines, you could also try "standing" or "prestige" or "prominence", or even - why not - "growing success"

Tony M Dec 8, 2018:

@ Asker 2 points:

If you use your version starting with "Again, ...", you need to be really sure that this does follow on from some previous statement — which actually, with "thanks", I'd find perhaps surprising; I suspect "We'd like to thank you once more...", if that fits with what has gone before, and gets away from any use of 'again'; the 'once more' would be OK if it was loosely referring to perhaps some thanking going on earlier in the letter.

Secondly, I would try at all costs to avoid using the possessive brand's — it is almost always ugly and awkward when used with inanimate objects, unless there is some kind of personfication going on. Also, rewording it differently may suggest other translations to you for the tricky bit; I suspect getting away from the "oh-so-French" construction using noun + of + noun in favour of some kind of active verb + noun would open up all sorts of possiiblities.