[ADD] sales: How to sell in foreign currencies

sales/products_prices/prices/currencies.rst

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+=================================
+How to sell in foreign currencies
+=================================
+
+Pricelists can also be used to manage prices in foreign currencies.
+
+* Check *Allow multi currencies* in :menuselection:`Invoicing/Accounting --> Settings`.
+As admin, you need *Adviser* access rights on Invoicing/Accounting apps.
+
+* Create one pricelist per currency. A new *Currency* field shows up in pricelist setup form.
+
+.. tip::
+    To activate a new currency, go to :menuselection:`Accounting --> Configuration --> Currencies`,
+    select it in the list and press *Activate*in the top-right corner. Now it will show up in
+    currencies drop-down lists.
+
+Prices in foreign currencies can be defined in two fashions.
+
+Automatic conversion from public price
+=====================================
+
+The public price is in your company's main currency (see
+:menuselection:`Accounting --> Settings`) and is set in product detail form.
+
+.. image:: ./media/public_price.png
+   :align: center
+
+The conversion rates can be found in
+:menuselection:`Accounting --> Configuration --> Currencies`. They can be updated
+from Yahoo or the European Central Bank at your convenience: manually, daily, weekly,
+etc. See :menuselection:`Accounting --> Settings`.
+
+.. image:: ./media/currency_rate.png
+   :align: center
+
+.. image:: ./media/prices_conversion.png
+   :align: center
+
+Set your own prices
+===================
+
+This is advised if you don't want your pricing to change along with currency rates.
+
+.. image:: ./media/pricing_currency.png
+   :align: center
+
+.. seealso::
+
+  * :doc:`pricing`

sales/products_prices/products/currencies.rst

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-=============================================
-How to sell products in different currencies?
-=============================================