Tricia, the older Deaf communities & sections of society in Britain were once upon a time, late 19th & early 20th C, gathered by special schooling and religious missionary almoners/social work into using/developing their language in spite of mainstream Hearing culture. Foreign travel/internationalism for most Deaf had seemed to be an impossibility.
Later 20C: Technology e.g. tv, cars, phones (and, for the Deaf, “inclusionist progress” closing special schools), had atomised us all (and Deaf users of BSL) but now mobile phones and internet facilitates meet ups and social media & texted or mobile spoken language use for minorities, including the very visually-based Deaf world, etc greatly. Especially this century, recent trends have opened up geographical cultural horizons for Young Deaf, reducing insularity again, potentially.
Communicating this new reality, BBC See Hear did a special series in 2017 (I think) where Rosie, a young BSL using reporter, visited 6 European capitals. In Berlin a café/food outlet run by Deaf entrepreneurs was fulfilling its mission to encourage Hearing clientele to order food using DGS (German signing) very effectively with posters, prompt sheets, etc. - I wish I could easily find a YouTube or bbc link for this, 
For spoken languages technology may/might support prompting via “talking” posters, menus and prompt-sheets.
