--- a/devtools/client/locales/en-US/layout.properties
+++ b/devtools/client/locales/en-US/layout.properties
@@ -37,8 +37,12 @@ layout.noGrids=No grids
 
 # LOCALIZATION NOTE (layout.overlayMultipleGrids): The header for the list of grid
 # container elements that can be highlighted in the CSS Grid pane.
 layout.overlayMultipleGrids=Overlay Multiple Grids
 
 # LOCALIZATION NOTE (layout.overlayGrid): Alternate header for the list of grid container
 # elements if only one item can be selected.
 layout.overlayGrid=Overlay Grid
+
+# LOCALIZATION NOTE (rowColumnPositions):
+# The row and column position of a grid cell.
+layout.rowColumnPositions=Row %S \/ Column %S

--- a/devtools/server/actors/highlighters/css-grid.js
+++ b/devtools/server/actors/highlighters/css-grid.js
@@ -25,16 +25,20 @@ const {
   apply,
   translate,
   multiply,
   scale,
   getNodeTransformationMatrix,
   getNodeTransformOrigin
 } = require("devtools/shared/layout/dom-matrix-2d");
 const { stringifyGridFragments } = require("devtools/server/actors/utils/css-grid-utils");
+const { LocalizationHelper } = require("devtools/shared/l10n");
+
+const LAYOUT_STRINGS_URI = "devtools/client/locales/layout.properties";
+const LAYOUT_L10N = new LocalizationHelper(LAYOUT_STRINGS_URI);
 
 const CSS_GRID_ENABLED_PREF = "layout.css.grid.enabled";
 
 const DEFAULT_GRID_COLOR = "#4B0082";
 
 const COLUMNS = "cols";
 const ROWS = "rows";
 
@@ -824,17 +828,18 @@ CssGridHighlighter.prototype = extend(Au
   },
 
   _updateGridCellInfobar(rowNumber, columnNumber, x1, x2, y1, y2) {
     let width = x2 - x1;
     let height = y2 - y1;
     let dim = parseFloat(width.toPrecision(6)) +
               " \u00D7 " +
               parseFloat(height.toPrecision(6));
-    let position = `${rowNumber}\/${columnNumber}`;
+    let position = LAYOUT_L10N.getFormatStr("layout.rowColumnPositions",
+                   rowNumber, columnNumber);
 
     this.getElement("cell-infobar-position").setTextContent(position);
     this.getElement("cell-infobar-dimensions").setTextContent(dim);
 
     let container = this.getElement("cell-infobar-container");
     this._moveInfobar(container, x1, x2, y1, y2, {
       position: "top",
       hideIfOffscreen: true