qt: Remove '0 BTC' placeholder from translation

src/qt/forms/overviewpage.ui

@@ -292,7 +292,7 @@
                  <string>Your current balance in watch-only addresses</string>
                 </property>
                 <property name="text">
-                 <string>0 BTC</string>
+                 <string notr="true">0 BTC</string>
                 </property>
                 <property name="alignment">
                  <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
@@ -317,7 +317,7 @@
                  <string>Unconfirmed transactions to watch-only addresses</string>
                 </property>
                 <property name="text">
-                 <string>0 BTC</string>
+                 <string notr="true">0 BTC</string>
                 </property>
                 <property name="alignment">
                  <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
@@ -342,7 +342,7 @@
                  <string>Mined balance in watch-only addresses that has not yet matured</string>
                 </property>
                 <property name="text">
-                 <string>0 BTC</string>
+                 <string notr="true">0 BTC</string>
                 </property>
                 <property name="alignment">
                  <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
@@ -386,7 +386,7 @@
                  <string>Current total balance in watch-only addresses</string>
                 </property>
                 <property name="text">
-                 <string>0 BTC</string>
+                 <string notr="true">0 BTC</string>
                 </property>
                 <property name="alignment">
                  <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>

src/qt/locale/bitcoin_en.ts

@@ -1565,15 +1565,7 @@ Address: %4
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="-91"/>
-        <location line="+25"/>
-        <location line="+25"/>
-        <location line="+44"/>
-        <source>0 BTC</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <location line="+64"/>
+        <location line="+67"/>
         <source>&lt;b&gt;Recent transactions&lt;/b&gt;</source>
         <translation>&lt;b&gt;Recent transactions&lt;/b&gt;</translation>
     </message>