Revert "Fix heatmap localization"

It conflicts with unmerged translations.

This reverts commit 708f4bc3b6.

web_src/js/components/ActivityHeatmap.vue

@@ -59,22 +59,8 @@ export default {
   </div>
   <calendar-heatmap
     :locale="locale"
-    :no-data-text="locale.contributions_zero"
-    :tooltip-formatter="
-      (v) =>
-        locale.contributions_format
-          .replace(
-            '{contributions}',
-            `<b>${v.count} ${
-              v.count === 1
-                ? locale.contributions_one
-                : locale.contributions_few
-            }</b>`
-          )
-          .replace('{month}', locale.months[v.date.getMonth()])
-          .replace('{day}', v.date.getDate())
-          .replace('{year}', v.date.getFullYear())
-    "
+    :no-data-text="locale.no_contributions"
+    :tooltip-unit="locale.contributions"
     :end-date="endDate"
     :values="values"
     :range-color="colorRange"