[hsbc] Rename investment labels and codes in iter_liquidity()

Customers complained about weird invest labels that they could not
identify in some of the invests. These invests are actually part of
iter_liquidity, therefore, in order to fit the liquidity model, I
renamed these investments with "Liquidités" and "XX-liquidity".
I on purpose did not use create_french_liquidity because here
liquidities are iterated with klass=Investment in pages.py and they have
specific attributes such as original_currency and invest_account_id.

Closes: 7977@zendesk