GUI: Remove unnecessary references to Bitcoin

src/qt/forms/sendcoinsdialog.ui

@@ -880,7 +880,7 @@ Note:  Since the fee is calculated on a per-byte basis, a fee of "100 satoshis p
                  <item>
                   <widget class="QCheckBox" name="checkBoxMinimumFee">
                    <property name="toolTip">
-                    <string>Paying only the minimum fee is just fine as long as there is less transaction volume than space in the blocks. But be aware that this can end up in a never confirming transaction once there is more demand for bitcoin transactions than the network can process.</string>
+                    <string>Paying only the minimum fee is just fine as long as there is less transaction volume than space in the blocks. But be aware that this can end up in a never confirming transaction once there is more demand for transactions than the network can process.</string>
                    </property>
                    <property name="text">
                     <string/>
@@ -893,7 +893,7 @@ Note:  Since the fee is calculated on a per-byte basis, a fee of "100 satoshis p
                     <bool>true</bool>
                    </property>
                    <property name="toolTip">
-                    <string>Paying only the minimum fee is just fine as long as there is less transaction volume than space in the blocks. But be aware that this can end up in a never confirming transaction once there is more demand for bitcoin transactions than the network can process.</string>
+                    <string>Paying only the minimum fee is just fine as long as there is less transaction volume than space in the blocks. But be aware that this can end up in a never confirming transaction once there is more demand for transactions than the network can process.</string>
                    </property>
                    <property name="text">
                     <string>(read the tooltip)</string>