Fix activity heat map padding & locale (#30823)

Fix #30808

---------

Co-authored-by: silverwind <me@silverwind.io>

web_src/js/components/ActivityHeatmap.vue

@@ -1,5 +1,6 @@
 <script>
-import {CalendarHeatmap} from 'vue3-calendar-heatmap';
+// TODO: Switch to upstream after https://github.com/razorness/vue3-calendar-heatmap/pull/34 is merged
+import {CalendarHeatmap} from '@silverwind/vue3-calendar-heatmap';
 
 export default {
   components: {CalendarHeatmap},
@@ -55,15 +56,16 @@ export default {
 </script>
 <template>
   <div class="total-contributions">
-    {{ locale.contributions_in_the_last_12_months }}
+    {{ locale.textTotalContributions }}
   </div>
   <calendar-heatmap
-    :locale="locale"
-    :no-data-text="locale.no_contributions"
-    :tooltip-unit="locale.contributions"
+    :locale="locale.heatMapLocale"
+    :no-data-text="locale.noDataText"
+    :tooltip-unit="locale.tooltipUnit"
     :end-date="endDate"
     :values="values"
     :range-color="colorRange"
     @day-click="handleDayClick($event)"
+    :tippy-props="{theme: 'tooltip'}"
   />
 </template>