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<syncfusion:GridSummaryColumn
Name="Location"
Format="SomeLocalizedTextNeededHere: {Count:d}'"
MappingName="Location"
SummaryType="CountAggregate"/>
Something like:
<syncfusion:GridSummaryColumn
Name="Location"
Format="'{Count:d}'"
MappingName="Location"
SummaryType="CountAggregate">
<syncfusion:GridSummaryColumn.Template>
<DataTemplate>
<TextBlock>
<Run Text="{lex:Loc MyLocalizedTextVar}" />
<Run Text="{Binding ??Count??}" />
</TextBlock>
</DataTemplate>
</syncfusion:GridSummaryColumn.Template>
</syncfusion:GridSummaryColumn>