Fix pools ranking titles

frontend/src/app/components/pool-ranking/pool-ranking.component.html

@@ -1,3 +1,4 @@
+<div class="main-title" i18n="mining.pool-share" *ngIf="widget">Mining Pools Share ({{ poolsWindowPreference }})</div>
 <div [class]="widget === false ? 'container-xl' : ''">
 
   <div class="hashrate-pie" echarts [initOpts]="chartInitOptions" [options]="chartOptions" (chartInit)="onChartInit($event)"></div>