diff --git a/client/components/stats/Heatmap.vue b/client/components/stats/Heatmap.vue
index b070934ba..44d1baa82 100644
--- a/client/components/stats/Heatmap.vue
+++ b/client/components/stats/Heatmap.vue
@@ -152,7 +152,7 @@ export default {
 
       this.showingTooltipIndex = index
       this.tooltipEl.style.display = 'block'
-      this.tooltipTextEl.innerHTML = block.value ? `<strong>${this.$elapsedPretty(block.value, true)} listening</strong> on ${block.datePretty}` : `No listening sessions on ${block.datePretty}`
+      this.tooltipTextEl.innerHTML = block.value ? this.$getString('MessageHeatmapListeningTimeTooltip', [this.$elapsedPrettyLocalized(block.value, true), block.datePretty]) : this.$getString('MessageHeatmapNoListeningSessions', [block.datePretty])
 
       const calculateRect = this.tooltipEl.getBoundingClientRect()
 
diff --git a/client/strings/en-us.json b/client/strings/en-us.json
index 6dba7adb0..f31a8a1df 100644
--- a/client/strings/en-us.json
+++ b/client/strings/en-us.json
@@ -805,6 +805,8 @@
   "MessageFeedURLWillBe": "Feed URL will be {0}",
   "MessageFetching": "Fetching...",
   "MessageForceReScanDescription": "will scan all files again like a fresh scan. Audio file ID3 tags, OPF files, and text files will be scanned as new.",
+  "MessageHeatmapListeningTimeTooltip": "<strong>{0} listening</strong> on {1}",
+  "MessageHeatmapNoListeningSessions": "No listening sessions on {0}",
   "MessageImportantNotice": "Important Notice!",
   "MessageInsertChapterBelow": "Insert chapter below",
   "MessageInvalidAsin": "Invalid ASIN",