[FIX] base: adding BYN to currenciest list

From 2016-07-01 BYN is new currency sign for Belarus
See https://en.wikipedia.org/wiki/Belarusian_ruble

BYR is no longer used.
Kept for backward compatibility and stability reason

Closes #22307

odoo/addons/base/res/res_country_data.xml

@@ -258,8 +258,8 @@
             <field name="name">Belarus</field>
             <field name="code">by</field>
             <field file="base/static/img/country_flags/by.png" name="image" type="base64" />
-            <field name="currency_id" ref="BYR" />
-            <field eval="0" name="phone_code" />
+            <field name="currency_id" ref="BYN" />
+            <field eval="375" name="phone_code" />
         </record>
         <record id="bz" model="res.country">
             <field name="name">Belize</field>

odoo/addons/base/res/res_currency_data.xml

@@ -406,6 +406,15 @@
             <field name="symbol">BR</field>
             <field name="rounding">0.01</field>
             <field name="active" eval="False"/>
+            <field name="currency_unit_label">Ruble BYR</field>
+            <field name="currency_subunit_label">Kapeyka</field>
+        </record>
+
+        <record id="BYN" model="res.currency">
+            <field name="name">BYN</field>
+            <field name="symbol">Br</field>
+            <field name="rounding">0.01</field>
+            <field name="active" eval="False"/>
         </record>
 
         <record id="BZD" model="res.currency">

odoo/addons/base/res/res_currency_demo.xml

@@ -349,6 +349,12 @@
             <field name="rate">10228.19</field>
         </record>
 
+        <record forcecreate="0" id="rateBYN" model="res.currency.rate">
+            <field name="currency_id" ref="BYN" />
+            <field name="name">2016-07-01</field>
+            <field name="rate">2.23151</field>
+        </record>
+
         <record forcecreate="0" id="rateBZD" model="res.currency.rate">
             <field name="currency_id" ref="BZD" />
             <field name="name">2010-01-01</field>