It's odd to see certain words being dumbed down in other countries, be it 'trimming' or using a version you'd use when communicating with children (as per usage presented in popular media, i.e. saying "eat your veggies" to a child).
- Vegetables are just called 'veg'.
- You don't get a shot, you get a 'jab'.
- You say 'whilst' instead of 'while'
- You don't get a turn, you 'have a go'.
- Band-aids are called 'plasters'.
- Many vegetables have different names. Eggplants are 'aubergines'. Cucumbers are 'courgettes'. Pickles are 'gherkins'.
So a headline like "To Promote Veg And Vaccines, Boris Johnson Has A Go With COVID Jab Whilst Eating A Gherkin and Walks Away With A Plaster" is maybe a little silly, but totally proper.
They also write 'Mr Johnson' without the '.' after 'Mr' - and they call the '.' a 'full stop'. Basically it's a real nightmare over here.
tl;dr - You should localize your US software for the UK market if you want to fit in. It's more different than you think. Even street addresses work differently here.
A lot of the above will make you fit in better, but some are kind of colloquial and the standard 'international' ones work fine. Nobody will find it unusual if you use 'while', for example, or ask for your 'turn'. True enough though, 'shot', 'band-aid', and probably 'eggplant' will mark you as an outsider. Some of them are also class-based, which is a whole other thing that I'm happy to say Americans suffer much less from.
Also, when in the US, I feel weird calling a band-aid a band-aid because it feels like corporate subservience. A bit like I feel a pang of rebellious disgust when using the word 'hoover' in British company.
Only pickled cucumbers are gherkins.
You wouldn't call a pickled egg or onion or whatever else a 'gherkin'.
The "-kin" suffix is diminutive. Etymology isn't destiny, but I think most American speakers think of gherkins as smaller than pickles.
Wikipedia is a little confusing on the subject. It confirms that gherkins are small, but also "up to five inches". Which is indeed small for a cucumber, but cucumbers bigger than 5 inches are rarely pickled (they get mushy).
So the notion of gherkins as "small pickled cucumbers" seems vague, and I think people disagree, but I don't know the geography of that disagreement.
And yes, if you get a "gherkin" in the USA it will be on the small side, but "gherkin" in the Commonwealth is just any (cucumber) pickle.
(In the US, a gherkin is a small pickled cucumber. A cornichon is a type of gherkin, but there are other types.)
That's exactly what a gherkin is in the UK.
What is 'a pickle' to you?