[bisq-network/bisq-desktop] Add popup if user has non-english language (#1612)

[Christoph Atteneder]

I just wanted to implement the warning for take and make offer as well, but it is not 100% clear at what point of the journey we want to inform the user.
![bildschirmfoto 2018-08-14 um 11 35 09](https://user-images.githubusercontent.com/170962/44084192-62130eaa-9fb6-11e8-87bc-a821911f7e4e.png)
The early warning would be when the user clicks on `Take offer` or `Create new offer to ...` the late one in the confirmation screen.
![bildschirmfoto 2018-08-14 um 11 35 31](https://user-images.githubusercontent.com/170962/44084273-8c91d31e-9fb6-11e8-84ff-3d19f669a670.png)
I personally would go for the early warning as the user already has transfered/locked some BTC when clicking on Confirm. @ManfredKarrer @m52go Any preferences?

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