Add missing resource string.

Author: comintern

Rubberduck.Core/UI/Settings/AutoCompleteSettings.xaml

@@ -111,7 +111,7 @@
                           IsChecked="{Binding ConcatVbNewLine}" 
                           Content="{Resx ResxName=Rubberduck.Resources.Settings.AutoCompletesPage, Key=ConcatVbNewLine}" />
 
-                <Label Margin="15,0,15,0" Content="{Resx ResxName=Rubberduck.Resources.Settings.AutoCompletesPage, Key=ConcatMaxLines}" />
+                <Label Margin="15,0,15,0" Content="{Resx ResxName=Rubberduck.Resources.Settings.AutoCompletesPage, Key=MaxConcatLines}" />
                 <controls:NumberPicker Margin="15,0,15,0" 
                                        NumValue="{Binding ConcatMaxLines}"
                                        MinNumber="{Binding ConcatMaxLinesMinValue}"

Rubberduck.Resources/Settings/AutoCompletesPage.resx

@@ -153,4 +153,7 @@
   <data name="SmartConcat" xml:space="preserve">
     <value>Smart-Concatenation</value>
   </data>
+  <data name="MaxConcatLines" xml:space="preserve">
+    <value>Maximum Lines</value>
+  </data>
 </root>