diff --git a/SourceGen/WpfGui/EditDataOperand.xaml b/SourceGen/WpfGui/EditDataOperand.xaml
index 679c3a8..b394c46 100644
--- a/SourceGen/WpfGui/EditDataOperand.xaml
+++ b/SourceGen/WpfGui/EditDataOperand.xaml
@@ -33,9 +33,15 @@ limitations under the License.
         <system:String x:Key="str_SingleGroup">Select data format ({0} bytes selected):</system:String>
         <system:String x:Key="str_MultiGroup">Select data format ({0} bytes selected in {1} groups):</system:String>
 
-        <system:String x:Key="str_StringMixed">Mixed character ({0} bytes) and non-character ({1} bytes)</system:String>
-        <system:String x:Key="str_StringMixedReverse">Reversed character ({0} bytes) and non-character ({1} bytes)</system:String>
-        <system:String x:Key="str_StringNullTerm">Null-terminated strings ({0})</system:String>
+        <system:String x:Key="str_NotApplicable">--</system:String>
+        <system:String x:Key="str_StringSingleFmt">{0} string</system:String>
+        <system:String x:Key="str_StringPluralFmt">{0} strings</system:String>
+        <system:String x:Key="str_ByteSingleFmt">{0} byte</system:String>
+        <system:String x:Key="str_BytePluralFmt">{0} bytes</system:String>
+
+        <system:String x:Key="str_StringMixed">_Mixed character ({0}) and non-character ({1})</system:String>
+        <system:String x:Key="str_StringMixedReverse">Reversed character ({0}) and non-character ({1})</system:String>
+        <system:String x:Key="str_StringNullTerm">_Null-terminated strings ({0})</system:String>
         <system:String x:Key="str_StringLen8">Strings prefixed with 8-bit length ({0})</system:String>
         <system:String x:Key="str_StringLen16">Strings prefixed with 16-bit length ({0})</system:String>
         <system:String x:Key="str_StringDci">Dextral character inverted ({0})</system:String>
@@ -129,7 +135,7 @@ limitations under the License.
         <RadioButton Name="radioDenseHex" GroupName="Main" Content="Densely-_packed bytes" Margin="0,4,0,0"
                      Checked="MainGroup_CheckedChanged"/>
         <StackPanel Orientation="Horizontal" Margin="20,4,0,0">
-            <RadioButton Name="radioDenseHexLimited" GroupName="Main" Content="...with a limit of"
+            <RadioButton Name="radioDenseHexLimited" GroupName="Main" Content="...with a _limit of"
                          Checked="MainGroup_CheckedChanged"/>
             <TextBox Width="40" Margin="7,-3,0,0" MaxLength="2"
                      Text="{Binding MaxDenseBytesPerLine, UpdateSourceTrigger=PropertyChanged}"/>
diff --git a/SourceGen/WpfGui/EditDataOperand.xaml.cs b/SourceGen/WpfGui/EditDataOperand.xaml.cs
index 0e28758..72156e5 100644
--- a/SourceGen/WpfGui/EditDataOperand.xaml.cs
+++ b/SourceGen/WpfGui/EditDataOperand.xaml.cs
@@ -670,57 +670,37 @@ namespace SourceGen.WpfGui {
 
             // Update the dialog with string and character counts, summed across all regions.
 
+            string UNSUP_STR = (string)FindResource("str_NotApplicable");
             string fmt;
-            const string UNSUP_STR = "xx";
             fmt = (string)FindResource("str_StringMixed");
             string revfmt = (string)FindResource("str_StringMixedReverse");
             if (mixedCharOkCount > 0) {
                 Debug.Assert(radioStringMixed.IsEnabled);
                 radioStringMixed.Content = string.Format(fmt,
-                    mixedCharOkCount, mixedCharNotCount);
+                    FormatByteCount(mixedCharOkCount), FormatByteCount(mixedCharNotCount));
                 radioStringMixedReverse.Content = string.Format(revfmt,
-                    mixedCharOkCount, mixedCharNotCount);
+                    FormatByteCount(mixedCharOkCount), FormatByteCount(mixedCharNotCount));
             } else {
                 Debug.Assert(!radioStringMixed.IsEnabled);
                 radioStringMixed.Content = string.Format(fmt, UNSUP_STR, UNSUP_STR);
                 radioStringMixedReverse.Content = string.Format(revfmt, UNSUP_STR, UNSUP_STR);
             }
 
+            Debug.Assert((nullTermStringCount > 0) ^ (radioStringNullTerm.IsEnabled == false));
             fmt = (string)FindResource("str_StringNullTerm");
-            if (nullTermStringCount > 0) {
-                Debug.Assert(radioStringNullTerm.IsEnabled);
-                radioStringNullTerm.Content = string.Format(fmt, nullTermStringCount);
-            } else {
-                Debug.Assert(!radioStringNullTerm.IsEnabled);
-                radioStringNullTerm.Content = string.Format(fmt, UNSUP_STR);
-            }
+            radioStringNullTerm.Content = FormatStringOption(fmt, nullTermStringCount);
 
+            Debug.Assert((len8StringCount > 0) ^ (radioStringLen8.IsEnabled == false));
             fmt = (string)FindResource("str_StringLen8");
-            if (len8StringCount > 0) {
-                Debug.Assert(radioStringLen8.IsEnabled);
-                radioStringLen8.Content = string.Format(fmt, len8StringCount);
-            } else {
-                Debug.Assert(!radioStringLen8.IsEnabled);
-                radioStringLen8.Content = string.Format(fmt, UNSUP_STR);
-            }
+            radioStringLen8.Content = FormatStringOption(fmt, len8StringCount);
 
+            Debug.Assert((len16StringCount > 0) ^ (radioStringLen16.IsEnabled == false));
             fmt = (string)FindResource("str_StringLen16");
-            if (len16StringCount > 0) {
-                Debug.Assert(radioStringLen16.IsEnabled);
-                radioStringLen16.Content = string.Format(fmt, len16StringCount);
-            } else {
-                Debug.Assert(!radioStringLen16.IsEnabled);
-                radioStringLen16.Content = string.Format(fmt, UNSUP_STR);
-            }
+            radioStringLen16.Content = FormatStringOption(fmt, len16StringCount);
 
+            Debug.Assert((dciStringCount > 0) ^ (radioStringDci.IsEnabled == false));
             fmt = (string)FindResource("str_StringDci");
-            if (dciStringCount > 0) {
-                Debug.Assert(radioStringDci.IsEnabled);
-                radioStringDci.Content = string.Format(fmt, dciStringCount);
-            } else {
-                Debug.Assert(!radioStringDci.IsEnabled);
-                radioStringDci.Content = string.Format(fmt, UNSUP_STR);
-            }
+            radioStringDci.Content = FormatStringOption(fmt, dciStringCount);
 
             // If this invalidated the selected item, reset to Default.
             if ((radioStringMixed.IsChecked == true && !radioStringMixed.IsEnabled) ||
@@ -735,6 +715,32 @@ namespace SourceGen.WpfGui {
             }
         }
 
+        private string FormatByteCount(int count) {
+            string fmt;
+            if (count <= 0) {
+                return (string)FindResource("str_NotApplicable");
+            } else if (count == 1) {
+                fmt = (string)FindResource("str_ByteSingleFmt");
+            } else {
+                fmt = (string)FindResource("str_BytePluralFmt");
+            }
+            return string.Format(fmt, count);
+        }
+
+        private string FormatStringOption(string fmt, int count) {
+            if (count <= 0) {
+                return string.Format(fmt, (string)FindResource("str_NotApplicable"));
+            } else if (count == 1) {
+                string fmtSingleString = (string)FindResource("str_StringSingleFmt");
+                return string.Format(fmt,
+                    string.Format(fmtSingleString, count));
+            } else {
+                string fmtPluralString = (string)FindResource("str_StringPluralFmt");
+                return string.Format(fmt,
+                    string.Format(fmtPluralString, count));
+            }
+        }
+
         /// <summary>
         /// Determines whether the data in the buffer can be represented as character values.
         /// Using ".DD1 'A'" for 0x41 is obvious, but we also allow ".DD2 'A'" for