[Change request to #62] As a user I want to change currency

[SkolozdraV]

Description of a Change request:

1. Update mockups
2. Update implementation of the currency switching

Reason for Change:
The discrepancy between user story #62 and the actual implementation of the currency switching

Update info:
Currancy toggle button is located on Navigation menu on the Header.
User can hover over the Currency toggle button on Navigation menu and change it from available (UAH ₴, USD $) by clicking on required icon.
The underlined currancy icon corresponds to the selected currency.

UAH ₴ is chosen by default.

After the currency is changed , the prices on all the pages, which contain prices (Product List Page, Product Detail Page, Cart, Checkout) are converted to appropriate currency.

Acceptance criteria:
Converted prices should be rounded to two decimal places including zeros.
Currency icon near price should be changed depending on the selected currency.
Currency should be changed on all pages which have prices (Product List Page ,Product Detail Page, Cart, Checkout).

US: #62 As a user I want to change currency