[bisq-network/bisq] Remove bold in title (maybe use medium or regular) and make blur overlay darker (#2682)

[Christoph Atteneder]

Darkened it now even more.
![Bildschirmfoto 2019-04-10 um 16 10 29](https://user-images.githubusercontent.com/170962/55885977-30eec380-5bab-11e9-9209-e413a5dcfa11.png)


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