Added currency picker into `LanguageView.qml`.
Added `category` and `imageSource` property to existing `CurrenciesStore.qml`. Renamed `code` to `shortName`.
Added `currenciesModel` property to `WalletStore.qml`.
Added wallet store into `LanguageView.qml` in order to link to the currencies model.
Added some tokens in the currencies store.
Made wallet and any currency related UI code that uses current currency use the new Display Currency value.
Removed no longer used wallet/settings related files.
Closes#5385