Fix regression in hiding the filter icon on column headers

Regressed with 0ae8336
as it changed the CSS selector

Author: CarsonF

src/components/Grid/DefaultDataGridStyles.tsx

@@ -137,12 +137,12 @@ export const flexLayout = {
   },
 } satisfies Sx;
 
-// Hide filter operator button - useful when there is only one operator
+// Hide the filter operator button - not useful when there is only one operator
 export const noHeaderFilterButtons = {
   '.MuiDataGrid-headerFilterRow .MuiDataGrid-columnHeader': {
     [[
       // Hide the operator button
-      'button[title="Operator"]',
+      `button[title="${GRID_DEFAULT_LOCALE_TEXT.filterPanelOperator}"]`,
       // Hide the clear icon button for select inputs
       // It seems cluttered, and it is only a couple clicks to clear it.
       '.MuiFormControl-root:has(.MuiSelect-select) + button:has([data-testid="ClearIcon"])',