[bisq-network/bisq] Cleaner formatting for trading charts date axes (#4715)

[deusmax]

Implemented the suggestions by @ripcurlx .

**Yearly charts**, show only year.
![Bisq-chartaxes-year_new-2020-10-29](https://user-images.githubusercontent.com/142019/97642631-5cb3f180-1a4e-11eb-858b-7928404c6a45.png)

**Monthly charts,** got rid of the date and chopped the year.
![Bisq-chartaxes-month_new-2020-10-29](https://user-images.githubusercontent.com/142019/97642681-76553900-1a4e-11eb-96e0-8bc52eb65ba8.png)


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