Currency conversion factor is ignored

[fmarangi]

• Shopware version: 5.5+
• PHP version: 7.2
• Expected behavior: Prices are multiplied by the conversion factor defined for the current currency
• Actual behavior: Prices are displayed as-is, their values is identical to the one found in FACT-Finder
• Steps to reproduce: Define multiple currencies (see for example SW sample data) and switch the currency via selector in the header

[fmarangi]

We have two ways to solve this:

1. export separate feeds for each supported currency
2. convert prices using callbacks before rendering

In the first case, the overhead on FF side could be very large, and potentially not sustainable. The second approach is more similar to what SW is doing natively, BUT we lose the formatting done by the Web Components and we have issues with the Price Filter, which wouldn't know anything about the converted price. It would be possible to translate labels if we are using steps in the price filter, but having a solid display on the price slider might take much more attention.